Malicious PDF — malware analysis report

Static analysis result for SHA-256 8403b065a1a2c5a6…

MALICIOUS

PDF

77.6 KB Created: 2021-03-02 14:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 50865f82145aac490bd42b8910ca35d2 SHA-1: 50a8967b6a3bb0263f444986023a28ed4edb90a5 SHA-256: 8403b065a1a2c5a6089efc196b1c5e101512c9fff6009d9f9b21799c97372589
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('zajinet.ru') that is likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to clinical products, designed to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://zajinet.ru/wb?keyword=is%20clinical%20fire%20and%20ice%20facial%20products PDF link annotation
    • https://cdn.sqhk.co/nawiwola/whdGP45/37818489235.pdfIn PDF document text
    • http://wwbook.org/59727400042u97up.pdfIn PDF document text
    • http://allieshouseofhope.com/78388344601r1t3l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375203/normal_60076a8d45ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_5fe872aabcd63.pdfIn PDF document text
    • https://cdn.sqhk.co/sobetevod/fgeXj08/fairway_solitaire_blast_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/6hddPbo/42496843161.pdfIn PDF document text
    • http://dalkomis.website/59843997493ca23v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457573/normal_5ff5179027ef8.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/hfapWgi/13924481623.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/yLibWii/fafumuzibonawumara.pdfIn PDF document text
    • http://rezonansmusic.com/what_is_on_the_origin_of_speciesclmoa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fce359d2e3b1.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/potofaw/4707574195.pdfIn PDF document text
    • http://gafodix.myartsonline.com/49730462521.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/shakespeare_sonnet_30_sparknotes.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/34484729626.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_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 5088 bytes
SHA-256: 904e5ed2ab4f7509600d28798d2ae5d4025aea45650ac69512fb7e68860b5b73
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 11020 bytes
SHA-256: 8026076bf9d43ae277f54033a2d099017d2608141121f1e84b39063783f8c0eb

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