Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb77911785279a3b…

MALICIOUS

PDF

110.4 KB Created: 2021-03-21 01:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f3fea8d07dd807c931d374fa575acd8 SHA-1: 9e1bfa146fe7b927716fc719afa92fa29b55683f SHA-256: fb77911785279a3ba668b06efc89d29ddff5f7f68f757157537cf4a6adce9c0c
346 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Internal Spearphishing T1059.007 JavaScript T1204.002 Malicious Link

This PDF document is identified as malicious by multiple heuristics, including ML classification and ClamAV detection. It functions as a credential phishing lure, impersonating a brand and directing users to a malicious URL hosted on disposable infrastructure. The document also contains instructions for handling password-protected archives, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/2230284.pdf.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bologen.ru/aws?utm_term=brocade+fabric+os+administration+guide+8.2.1x PDF link annotation
    • https://dupevolorimix.weebly.com/uploads/1/3/4/5/134588768/2230284.pdfIn PDF document text
    • http://chunyoo.com/xifuxotoxizojonf3.pdfIn PDF document text
    • https://dazuzoboda.weebly.com/uploads/1/3/4/0/134017564/ditev.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/9752534.pdfIn PDF document text
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/bovebezezodo.pdfIn PDF document text
    • https://kodejisejawap.weebly.com/uploads/1/3/2/3/132302923/58ef8.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/kowaxalu.pdfIn PDF document text
    • http://videohost.space/how_to_program_my_directv_genie_remote_to_control_my_tvcnthd.pdfIn PDF document text
    • https://nomikevokatipo.weebly.com/uploads/1/3/1/8/131859895/2725670.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_89286fcd26644771a15e6271dd7c4cda.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_e68b6b48ad98485abdc5b27a5acd9b82.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_c75d59f090ab47d7b5ccf1909ad851c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb85e3ad-4876-4f08-b533-f00318b7f9e0/is_it_good_to_mow_lawn_without_catcher.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_c8c8ad7c114e4ac8af551db04bd0b921.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96964f7d-d560-4ffe-9660-0390200919ba/how_to_score_fear_of_intimacy_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c688103-6f69-4fdb-bfb8-7f82b9a350d7/hace_cuantos_aos_aparecio_el_ser_humano_en_la_tierra.pdfIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_18835785ad5b4f419985c076ff7501fa.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_5ae3d2fafc944cc08fd4ccdd6ca95a1f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/79a1517e-f707-4be9-847e-6744498ddf8e/nulizifezisepoxeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65231ec-8fb2-4539-b52b-8715dd397fd0/pazarenolisabufoji.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16227 5856 bytes
SHA-256: 3266cc218ea15c3b4b3a3cad595089dd48db17ce3bf21c0af1f4b8d56c8aac5a
font_01_sfnt_off00017607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17607 11504 bytes
SHA-256: 49b0e639d5e82b539be5deee6d2ce04f0a480a86eca74b8d725e98732f11d294
font_02_sfnt_off00019d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D06 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361