Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded104f583407ea6…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 05:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c8ea428a03cb7d023bfa74b63c9a2c56 SHA-1: 99670c6fdcf59a4874e44c669ba0745ed185df01 SHA-256: ded104f583407ea6ed338d4c3036073c399aff18d69d4d54ceacaaa3daa6c2c3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, contains keywords related to a book review, likely serving as a lure to encourage clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://fokemale.ru/strik?utm_term=resenha+do+livro+raizes+do+brasil+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376878/normal_60007960d3caf.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/xenad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_600dfc0b0a32a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412165/normal_6021659e17ad1.pdfIn PDF document text
    • https://tuzenuzibawura.weebly.com/uploads/1/3/4/7/134733138/1320182.pdfIn PDF document text
    • https://nujalujuxak.weebly.com/uploads/1/3/5/3/135347358/wefutedasirave_binaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fed972e95614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5fe8992fdc7e8.pdfIn PDF document text
    • https://pumazamobu.weebly.com/uploads/1/3/0/8/130874095/4013113.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/2532946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385876/normal_60463f6391cc9.pdfIn PDF document text
    • https://ronizizuvuf.weebly.com/uploads/1/3/4/7/134707383/5412929.pdfIn PDF document text
    • https://xapovakugad.weebly.com/uploads/1/3/5/3/135393008/nemomokowanutobage.pdfIn PDF document text
    • https://gotakepe.weebly.com/uploads/1/3/4/7/134763382/zibokum-vomifawanoxus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_601801e33c339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_5fd64ad871645.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/a8bec007d1ef.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://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_8c57ed6ba3cf40d390fd63385cc7e42e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/lonefevijizavevesurusuf.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/your_dad_is_calling_ringtone.pdfIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_05a3fdfc5f7847ab8d6a605ccfbca2ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/different_types_of_influence_tactics.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_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 5096 bytes
SHA-256: 7aa69f33597fd6a8b6e4991db0be0e6247cbeeb246f80477c5655a480b27778e
font_01_sfnt_off0000ff97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 12988 bytes
SHA-256: c927679812f57c4aeee988b19a59b46bd6413d8a1d5dc287c49592e98a556f63
font_02_sfnt_off00012773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12773 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378