Malicious PDF — malware analysis report

Static analysis result for SHA-256 358385f2869b1fd0…

MALICIOUS

PDF

74.0 KB Created: 2021-01-21 13:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8428300b44216eaa3608c3a58e890314 SHA-1: c7049ee0a48cee1783e1fc91af22e307e65ccaa2 SHA-256: 358385f2869b1fd07ccb3ff26639ebf31147474adfb93bfaa27204870f1ac1a9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead 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://trafffi.ru/123?utm_term=heartwell+golf+course+tiger+woods PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449973/normal_5fd647c7c1c9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473640/normal_5fe77cf93390f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375358/normal_5fed8159862a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fdc326c6be47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_5fe70ad11b696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410986/normal_5fe480dba0e0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5fc6926b656b6.pdfIn PDF document text
    • https://pukexomupuko.weebly.com/uploads/1/3/1/1/131164185/katutulezaseb.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/tozaduliwubega/lawegasivodafejum.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/prefix_suffix_worksheets_7th_grade.pdfIn PDF document text
    • http://gefuxexo.epizy.com/pitixugiruvijesat.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/xemofuzuboxidodafoxiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/muruna.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/23452262687.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/78066226147.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/sejafimokawilolave.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_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 5240 bytes
SHA-256: 5a065bea93771caf316a0fcccc6f8959ee8ec6a44583bf92af53b052135d5692
font_01_sfnt_off0000f728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF728 10544 bytes
SHA-256: d4a0c245fcc8bd47c40859c8fe9fb56aa96c56839b8bba513bb2a04fc370dfa5

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