Malicious PDF — malware analysis report

Static analysis result for SHA-256 349aa8b7f33e2744…

MALICIOUS

PDF

74.9 KB Created: 2021-03-03 18:07:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05ea345df3fe0b225b73721c40cdb124 SHA-1: bf8f938867065fe29ecdc855b263030b0c14324f SHA-256: 349aa8b7f33e27444941a6c1350f037ec5e5731ee8ea366f5fd94fea875d727e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with heuristics indicating it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=best+mini+ipod+speakers PDF link annotation
    • http://googsnat.space/49417022902cg13k.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/7jgawjc/draughts_definition_in_dictionary.pdfIn PDF document text
    • http://wekeb.space/49531308338b8v6p.pdfIn PDF document text
    • http://ouily.xyz/feltham_prison_reportgsucd.pdfIn PDF document text
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/torewegivejugute.pdfIn PDF document text
    • http://cherrypimp.online/tight_spiral_perm_before_and_afterasy8g.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/jgewhbJ/2323628981.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ff1adf68d356.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/tovugemogizutup_difanotuk.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/SjdHhhf/the_jackbox_party_pack_2_ps4.pdfIn PDF document text
    • http://cashtanks.fun/nejonukegodesugasewixedaxyu7wp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409621/normal_6008b1142f16c.pdfIn PDF document text
    • http://blognews.top/fraction_decimal_percent_conversionw7jk4.pdfIn PDF document text
    • https://sivenusa.weebly.com/uploads/1/3/1/1/131164431/3481199.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 5184 bytes
SHA-256: 19bf1d0890a1e6e9fb4e6b3c7b3960fd4d51d40f5d652a3fe46be7ba2d6ecf25
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 11096 bytes
SHA-256: f44a8918feb7a73884537897d97a81cedde9744dba7d808cc17d571be811fa97

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