Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac1b35a0e9b7f2b…

MALICIOUS

PDF

72.9 KB Created: 2021-04-25 03:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6d823db2ffb4a04a0cf5408d52225dd SHA-1: 2539fc3ec560b23e6caec4cc7e5fadd7e998d766 SHA-256: 0ac1b35a0e9b7f2b4740a118b59cc48500ec3892731b8054cc97c89f9eeaf09d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain likely used for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and embedded links suggest it is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=hp+officejet+pro+x476dw+mfp+duplex+module
    • https://cdn-cms.f-static.net/uploads/4485570/normal_6020a57498f1a.pdf
    • https://cdn.sqhk.co/jebanufebejo/gjjdncn/dialer_app_lock.pdf
    • http://vedice.ru/maworewm3ms9.pdf
    • https://cdn-cms.f-static.net/uploads/4401697/normal_601b9e47dab1b.pdf
    • https://cdn.sqhk.co/sezogitov/ghgYP3O/gate_buzzer_opener.pdf
    • http://garantiya62.ru/2007_softail_service_manualin5pq.pdf
    • https://cdn.sqhk.co/rupomotiz/jc3iewQ/trending_viral_videos_download.pdf
    • https://cdn-cms.f-static.net/uploads/4446789/normal_605508212ce20.pdf
    • https://cdn.sqhk.co/bupusudiva/9XmmgjT/sawipunulotujixoza.pdf
    • https://cdn-cms.f-static.net/uploads/4375703/normal_6026b95aa51c2.pdf
    • https://cdn.sqhk.co/dasewugiru/jdIghIR/vikonuvonupogebamafeza.pdf
    • https://cdn-cms.f-static.net/uploads/4452395/normal_604908bcd1965.pdf
    • https://cdn.sqhk.co/totarujined/T7QyjhT/nizulojiwofekigogaxi.pdf
    • https://cdn.sqhk.co/boguzivipel/jkjiJgi/57492803595.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_0d052e0bae1c4858b18e00c9dc85d355.pdf?index=true
    • https://s3.amazonaws.com/kigavanus/38651278140.pdf
    • https://s3.amazonaws.com/watajive/list_of_literary_terms_and_their_definitions.pdf
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_e63e0648114b41589d9c1b9d2164d6c5.pdf?index=true
    • https://s3.amazonaws.com/wazorixekunafob/how_do_you_answer_merci_in_french.pdf
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_c1fe7527d7504b1785d150cb3b34251c.pdf?index=true
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_a94e8d138bf5470bbfe7457c68f6d2ad.pdf?index=true
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_f01d2b6ebea1490eb0978842149a2df1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf0.bin
5984c8bf6958b51912b064db6ce2d64158f92098618c7149df5eb44dbfc89793		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 5432 bytes
font_01_sfnt_off0000f08b.bin
542e275d376b69c017edef22980607257fb0b4ab5ceb47415efa0a2d70aad4ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 10504 bytes

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