Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d27a1470feee7d…

MALICIOUS

PDF

65.6 KB Created: 2020-11-24 04:48:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 62dd9bc902a81cae7e00fefa0d5fdcf7 SHA-1: 58b4c761763f2924972dd8111cc7b6b6ee8e00f6 SHA-256: d2d27a1470feee7d2cfc0e5ddd4f975a33a29a84fc6a668bc64c59a8a0f3253c
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The presence of a malicious redirector URL and a critical ClamAV detection further supports its malicious nature. The document body's garbled content and the 'Fake invoice / payment lure' heuristic suggest a deceptive pretext for the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://gettraff.ru/strik?utm_term=care+plan+books+nursing+students In PDF document text
    • https://xinotojopafexiz.weebly.com/uploads/1/3/4/3/134316842/zosirajazumu.pdfIn PDF document text
    • https://paxepufa.weebly.com/uploads/1/3/4/6/134640660/c19783bdc.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/zesisawexosalezala.pdfIn PDF document text
    • https://wobusaxumezi.weebly.com/uploads/1/3/4/8/134881220/6152938.pdfIn PDF document text
    • https://jomunibudax.weebly.com/uploads/1/3/4/3/134342604/f8129.pdfIn PDF document text
    • https://pibepiramizenat.weebly.com/uploads/1/3/4/7/134735255/wereradoruk-revebiwames-wogodamegule-mosig.pdfIn PDF document text
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/dubogisimeza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5fa7fddc05152.pdfIn PDF document text
    • https://liguputuked.weebly.com/uploads/1/3/4/5/134501996/6816416.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/rimejiguvif/new_riegel_ohio_2007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4758ddca-1b9f-4b2a-87aa-b61ad91c697c/33223785784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f989982c-cfbe-4222-a015-205806951dc8/rokaj.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_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 5236 bytes
SHA-256: 2c3ccac69a54cbf0f1863e8845da5c017467e26b3ae1ebf2f983e236c82f7573
font_01_sfnt_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 10096 bytes
SHA-256: 93873a2a91dcab3c69bd70659cf21575e407d5c57ca149a690a2caddaccaeebf

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