Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9b100a5bd7d7e0…

MALICIOUS

PDF

64.3 KB Created: 2021-02-11 15:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c82efcf5f329608436bf3b47165a5e19 SHA-1: 9bf639e76af3eb04ef2925cf3ca405bc96bab684 SHA-256: df9b100a5bd7d7e0944658efcbb3ae29bcb8abe28daf38c4bca9e7b5ad7922bc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, likely intended to direct users to malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to exploit users through deceptive content and external redirection.

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://jottigo.ru/wb?keyword=antropologia%20cultural%20pdf PDF link annotation
    • https://tipoxuxol.weebly.com/uploads/1/3/0/8/130814923/8081692.pdfIn PDF document text
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/9245879.pdfIn PDF document text
    • https://lizodeva.weebly.com/uploads/1/3/5/3/135342900/7fcc8767.pdfIn PDF document text
    • http://carins.info/welsh_government_food_and_nutrition_guidelinesay2v6.pdfIn PDF document text
    • http://b0xberry.online/mystic_messenger_jaehee_route_guideibx77.pdfIn PDF document text
    • https://wexetapita.weebly.com/uploads/1/3/4/3/134307875/8775809.pdfIn PDF document text
    • https://fekipasipoxow.weebly.com/uploads/1/3/1/6/131637207/2148126.pdfIn PDF document text
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/a118049c3e.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/retisovojor/print_newsletter_templates_indesign.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/62763361309.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/wordscapes_answers_level_1126.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_off0000c2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BE 5136 bytes
SHA-256: 6758304b63b7ed2208c5606ed28829eaab902e8a74809691429f59d9b48ad6a8
font_01_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 9556 bytes
SHA-256: 42a1b9bac6a7d39b9a46019375015160250eb05802929764a3f3ba4ddd794687

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