Malicious PDF — malware analysis report

Static analysis result for SHA-256 e558ed1e8099580b…

MALICIOUS

PDF

64.7 KB Created: 2021-01-13 14:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f2989ff737bd0ff68c59edb7d0b89934 SHA-1: 0d02835eef7456fa917488a6c003dfb5a949f233 SHA-256: e558ed1e8099580ba3e39167f6103f863d2560ea2f533a344037512527e367ab
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to 'trafffe.ru', suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' further supports the attack pattern of directing users to external, potentially malicious, sites. No scripts were extracted, but the document body contains obfuscated text and metadata suggesting it was generated by wkhtmltopdf, which can be used to create deceptive documents.

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/123?utm_term=pier+one+tucson+hours PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fd2ad85ce76d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454280/normal_5ffd290219543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451049/normal_5fb7811c33512.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/nukexifepejisox.pdfIn PDF document text
    • https://tizukusijevawus.weebly.com/uploads/1/3/4/4/134454617/8287341.pdfIn PDF document text
    • https://site-1168535.mozfiles.com/files/1168535/71697602897.pdfIn PDF document text
    • https://site-1172290.mozfiles.com/files/1172290/90833025604.pdfIn PDF document text
    • https://site-1176519.mozfiles.com/files/1176519/luravokepasudebefori.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/tomamujuf/2019_answer_key_prmo.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/jabufiremafixun.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/sparkle_effect_photoshop_action_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/cardinal_health_stock_performance.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_off0000c239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC239 4648 bytes
SHA-256: 66421ae3c625aeda6f5730fe2e2cdfb43b1935172b1de7b26632823ed44c6edc
font_01_sfnt_off0000d202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 10624 bytes
SHA-256: 8c772e89cd2f9f27237e3d05b547460dc125c9ccb6c55494f0b1614d01511078

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