Malicious PDF — malware analysis report

Static analysis result for SHA-256 4841fbc0caa8fb80…

MALICIOUS

PDF

69.3 KB Created: 2020-12-28 00:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6892707dd9cb5134bc56cd1c5b9793 SHA-1: 7e8a621f38fd45552a24b18a88cdcdafcca55eb0 SHA-256: 4841fbc0caa8fb80d86ec8806790164e40b2b52110db7ab8e1dbea757a7abd80
186 Risk Score

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, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://trafficel.ru/strik?utm_term=pokemon+go+ball+plus+review
    • https://pabifiliponisod.weebly.com/uploads/1/3/4/3/134367040/nomotowomune.pdf
    • https://fawubanine.weebly.com/uploads/1/3/4/3/134321827/3231830.pdf
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/5bd20.pdf
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/179592.pdf
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/balasaze-tojexojeriru.pdf
    • https://vabekozel.weebly.com/uploads/1/3/4/4/134487462/toxunimufu-rupekijipi-jukosu-rajafubeto.pdf
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/5cffe168bf.pdf
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5fc2a08608330.pdf
    • https://duwobimisenuzo.weebly.com/uploads/1/3/4/6/134615726/nodixubowipip-saduf.pdf
    • https://fezimadi.weebly.com/uploads/1/3/4/4/134487715/jobenotik-bewibunorotul-dixodogulapiju.pdf
    • https://busuwezaba.weebly.com/uploads/1/3/4/0/134042496/7266768.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/diwitapezu/71221140733.pdf
    • https://s3.amazonaws.com/lokijuronig/43887577897.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1fd.bin
9cb32ab4cddc76718c1ba0a3b819f0439ed600bc222c1c822a41ace04b95d5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FD 5496 bytes
font_01_sfnt_off0000e4ac.bin
824a1a96c3c78cd05804f833bca94ebff47ab82a4d774001e6469b9ca542b73d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 10624 bytes

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