Malicious PDF — malware analysis report

Static analysis result for SHA-256 264922d7ed19a870…

MALICIOUS

PDF

69.4 KB Created: 2021-02-21 09:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 64b0f94d390c0e36b3860d9e0cbee285 SHA-1: b3cf80849c13cbdee4fa4e95f8b7349983643bc0 SHA-256: 264922d7ed19a870552c563ef014e8d64610aac0042c9d0a5fb76f9b7c0e4a18
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://leonvi.ru/strik?utm_term=how+to+apply+for+bpsc+exam PDF link annotation
    • http://lomigizukifomor.22web.org/mejobipovoketikazavaredu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5ff807563f3cf.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/iftgjji/ludo_neo_classic_old_version_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_6016c91dab2e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_600eb03512a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_60279ab8ac853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fcbf5f0d4e27.pdfIn PDF document text
    • http://nufarelarapo.iblogger.org/zigekowem.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/ificjdc/xodel.pdfIn PDF document text
    • http://nagupenaxija.iblogger.org/oxidative_stress_book.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/musoxifuvitalo/the_killing_joke_movie_ending_explained.pdfIn PDF document text
    • http://rukojipunuwupur.epizy.com/papagidaw.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_off0000d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD267 5524 bytes
SHA-256: ef5a64597b32a900cd3645ca73ef23a11b1457e3b7431348c6c20bf83224edfd
font_01_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 10636 bytes
SHA-256: 99fb7c08ab64ad5673e60f0a8b0f6f3d781a54b9e0076e76e0ddc1c3142a98ac

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