Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a90e9751ea2879…

MALICIOUS

PDF

90.1 KB Created: 2021-04-01 15:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 54f4e41dabffe7c6918f2d9acbbeec38 SHA-1: c65ba8a240979905b3422d57dd19a3aae7db6f0b SHA-256: d1a90e9751ea2879c836643a77254fdb3ee998005bc67c4b2c01a4a6dc3d8ebd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is `https://resalured.ru/award?keyword=acido+borico+usos+pdf`. The presence of many external links on disposable hosting suggests an attempt to manipulate search engine results or direct users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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.
  • 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://resalured.ru/award?keyword=acido+borico+usos+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479933/normal_5fcab02ddaca9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378149/normal_5ff5b5d5d7060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489586/normal_6046da6fcf5be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_6029819fcab2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_6029a28b6f15c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473640/normal_6036b57b68525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_602c4fd1d8aee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_e6d71aff3eb44c208532535dd768fd26.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_f217b9e692114800a48e4ef9441125c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/866f2afa-4ef1-4ea0-821a-43e81c6b6862/keurig_k145_not_brewing.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/menaxigijoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de35f2c8-eb67-4b70-ad2d-50196d2e12aa/flag_football_drills_for_9_year_olds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1dfd479-498d-456b-b47c-596eb83e0b90/49825083550.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_86f4dd1d60a84a57940760a01f71964c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0f21780-56fe-4c5b-8cfb-901ffcef0baf/triton_ii_sand_filter_tr100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681d3e3e-1fba-4e6d-8092-9fe0b294de63/85998518977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd2499f6-448e-492e-ab68-c492443a1278/mini_14_scope.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_09a42070172945efa0c26fc3391a3339.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/744c8a69-6f4e-4f95-a12b-40c10c1a755e/dedewutuwizarezijinado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618f2e6a-98b2-428e-bc66-a114ee08e180/gebogulirazerepibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b887b955-5fc7-47e4-b4f6-8d2bbb62908d/vutevo.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_f112598c7bb745d39962e21c309557e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/77205256421.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/what_jobs_can_you_get_with_a_public_speaking_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/86235984871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83398a9b-2812-43d9-b66f-0835c99fbcf6/17305905993.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/instructions_for_cleaning_keurig_2.0.pdfIn 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_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 5036 bytes
SHA-256: 627dfb885be7ee20942f71a2ae157e6ff4efff3c18ad4dfa8bfac76957860af3
font_01_sfnt_off000117ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EE 13584 bytes
SHA-256: 28ad65b97ffbe62d20bd37050b4a35bd51b4bce7a58d9ff535c66401ff6844f6
font_02_sfnt_off000143a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A8 16260 bytes
SHA-256: a56c3305eae8c274f9530afc53b94bb11aea5b2e4106fccae25e6adbba8aa2c3

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