Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11257f3ee1caaa4…

MALICIOUS

PDF

102.7 KB Created: 2021-03-17 21:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ee7863f066fb63a926c067f4a63e7ff2 SHA-1: ab504652b9aeb1a0e95f1af5856ae6ea5008d297 SHA-256: e11257f3ee1caaa4f9291ea11c7b33d4cd5673ce8d9654d32ee792e3814af4ad
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating a phishing and link farm attack. Notably, it impersonates the 'Target' brand and uses a deceptive download button to trick users into clicking malicious links. The presence of numerous external links, some pointing to disposable hosting, further supports this assessment. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/kasuk-muxemidojube.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/strik?utm_term=power+hold%2527em+strategy+pdf+download PDF link annotation
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/kasuk-muxemidojube.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/sarino-gepapawizufi-robixe.pdfIn PDF document text
    • https://rifodajawu.weebly.com/uploads/1/3/0/7/130739776/8fff65.pdfIn PDF document text
    • https://tolorojefa.weebly.com/uploads/1/3/2/6/132681575/tames.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_90e68f0aef714c8dbe97f68cdaefeef9.pdf?index=trueIn PDF document text
    • https://9f2a6cc1-6e15-4467-beaa-57274ca996ed.filesusr.com/ugd/78f4c3_d2cbbda8cfc64c86bed6c657dd85359a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ac303a-ce45-4f62-b44e-ae2ecf2775c6/57748634115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/261e5bee-e7f5-4144-9b28-fd78a8e4c076/salazomutatoxif.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/aio_er_latest_version_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a418483-063e-4201-8b4e-722cc103b44d/lerixizawijekira.pdfIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_c2ce6482cd0e4c00a1847be831fb3802.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_9e461b7db53245cdb673470b8f51e7fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/top_10_interview_question_and_answer.pdfIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_b079866d15824b6cbd2966f6b32e4e57.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_82deffa3f7a54ed5baa1d3db2834a7f8.pdf?index=trueIn PDF document text
    • https://d668ac4b-7052-46b9-8d0c-7e282d24ced7.filesusr.com/ugd/00fc84_a0bfbbe118a84ccd81ea8be8c9625b98.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d03d6db-3540-4073-a52e-845325a0a33f/korogomotirixaniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9cb7c81-203e-4052-81db-803d20b2a351/17661954686.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_ca578fceb82f4b87932c0a1497d5ac65.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_f708c3b22c4b466eba28e75a3c302293.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_145ff8e78e0b435eaab3d7d8dd54b758.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/66388666219.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/dabibope.pdfIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_ae21a39db5934875be025566b45b25d2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13972 5684 bytes
SHA-256: fcdb54320f022aae11b1bd7ac77134ea113d9e67265551d3bb9fadfe8c1d7c67
font_01_sfnt_off00014cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCA 12924 bytes
SHA-256: 1319d1b9b088a4ddb883a7d65b06589972314444e34247974cb891f651942bc7
font_02_sfnt_off0001774f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1774F 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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