Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57442e57f72cd5d…

MALICIOUS

PDF

67.4 KB Created: 2020-11-14 18:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 04ccee007648f6936c9e85e8ea8f2367 SHA-1: df9d58e5c7be4923d97fe9a1273177e7cc7fe071 SHA-256: b57442e57f72cd5da0b3055defaa3b09ba563c1bcd3771411e0f6c13bc269b49
186 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, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests a phishing or tracking intent. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/strik?utm_term=gatech+cs+2110 PDF link annotation
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/4070303.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/f33a172c23f1.pdfIn PDF document text
    • https://subefurova.weebly.com/uploads/1/3/4/5/134505332/9d91248fed.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/selagu-wugixinoxule.pdfIn PDF document text
    • https://pofumojonoro.weebly.com/uploads/1/3/4/4/134474045/gutiledewujuvokegi.pdfIn PDF document text
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/wulixizawafot-vifezemex.pdfIn PDF document text
    • https://pigofularujatuf.weebly.com/uploads/1/3/4/3/134360020/vifezugolalesogizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5f92dd0815392.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/rarek-muganize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/379f8521-bdfa-446c-bd95-aba0e123b5d3/woxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d0daba-c4d3-456b-b7c8-5453712c6a80/amcor_air_conditioner_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417039db-a30e-494a-96f5-2270ec22be4c/61012503929.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 5116 bytes
SHA-256: 879eef82896b8da9687670c2fa3decf01def98647f3962331b576149be4ad026
font_01_sfnt_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 10904 bytes
SHA-256: ea472cfc5e4e1b8d72c6cff5cc8c0a09067f08087d3205a763f72b5d7288bd79

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