Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e8f7d9594b6e19…

MALICIOUS

PDF

62.5 KB Created: 2021-02-07 01:35:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: cff828c6f368cf471546a22d436251df SHA-1: 21d93c0a9e43ff977ef0ab1d0a09ac708293ab8e SHA-256: 61e8f7d9594b6e19639f316be0fb41e3d27b9ef35d3710e57f50f4b535195dc0
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=le+subjonctif+exercices+ccdmd PDF link annotation
    • https://betewobinolatid.weebly.com/uploads/1/3/4/7/134756009/nedokidolo.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/5264390.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/3593262.pdfIn PDF document text
    • http://qwonder.space/gazoxovqj0y.pdfIn PDF document text
    • http://reduslim-shop.website/photo_editor_apk_free_for_pc1h5vo.pdfIn PDF document text
    • https://berarenojinoz.weebly.com/uploads/1/3/4/7/134737003/2093777.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/Sieq1nZ/miluvexemu.pdfIn PDF document text
    • http://podarokinsta.online/mathematical_analysis_rudinvidms.pdfIn PDF document text
    • https://vinadesafabav.weebly.com/uploads/1/3/5/3/135305522/pinen-didegafib-xorakaseneku.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/Sicghhc/12175489675.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/hbhiht6/rodoxeveximujijax.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/vobuturinivi/collaborative_learning_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/43766120236.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_off0000b551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB551 5148 bytes
SHA-256: 2f873aff085f223f699329250efdc4a17529e5f37989b1a5c57847e28587cfb4
font_01_sfnt_off0000c6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D1 11452 bytes
SHA-256: d6ab36be5eb79dd3547d80d9874b8c88237ce5e9dbb16e42c751ec1d5eaeb43e

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