Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fcc2bf67fe9628…

MALICIOUS

PDF

73.3 KB Created: 2020-12-25 20:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b6ffbbf806a2ca901739c193d0622602 SHA-1: 9436ba751aa34246392d04130e5b72dc638317d6 SHA-256: b1fcc2bf67fe9628afc8110ab3bf7eaff0a88c6179766359847e0f41dc7c5f47
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating a phishing or trojan threat. It contains a large number of external links, with the primary suspicious URL being trafffffe.ru, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=faith+family+academy+basketball PDF link annotation
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/lilokumepogunes.pdfIn PDF document text
    • https://raxasowofano.weebly.com/uploads/1/3/2/6/132681821/rinarajagoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f9c7b1327814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5fa8b0e73e817.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/7870518.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/c91378c2ea6d6c7.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/YNjfwia/escape_the_prison_13_walkthrough_level_1.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/591283.pdfIn PDF document text
    • https://cdn.sqhk.co/vetesomiw/qgiKGhj/picture_video_maker_free_with_music.pdfIn PDF document text
    • https://galovuxo.weebly.com/uploads/1/3/4/7/134760431/gomovoviw-segazefixabonun-jamobojam-xafajevoroju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/periodic_table_trends_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/vojixubigakifudo.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/blood_stains_white_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/political_ideology_quiz_worksheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE069 5424 bytes
SHA-256: a8886b8e6f318719366b42690bdf44defdde852c666cd63b333e9cadbe895e9e
font_01_sfnt_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 11024 bytes
SHA-256: c2657cdc9c3f7e2fadb093c1569c1dfa8612d30e36b61ac92b07d7d8e6aaec00

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