Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb7637a0d8734d5…

MALICIOUS

PDF

80.9 KB Created: 2021-03-14 19:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0b0dc077474d115747c3b905b10d0114 SHA-1: 23340e0cd229d8f58a1c51ce407ac079f0c3f788 SHA-256: 3bb7637a0d8734d5896b8bf499fb150f694b80a0710137c106701900de218002
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with one specifically pointing to 'nipisod.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded links indicate it's designed to redirect users to potentially harmful external 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://nipisod.ru/123?utm_term=antiinflamat%25C3%25B3rios+n%25C3%25A3o+esteroidais+aines+pdf PDF link annotation
    • https://cdn.sqhk.co/dimumaneda/Fgj0heu/sesibufiretexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_601a0e1a30d90.pdfIn PDF document text
    • http://megatorg.ru/huskee_lt4200_price_newz2itw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424011/normal_5fe1730262dba.pdfIn PDF document text
    • http://mybiol.site/all_appropriate_preposition99h2k.pdfIn PDF document text
    • http://mattelipsticks.site/95460908124te8h7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6022d0a809fe2.pdfIn PDF document text
    • http://antonioit.fun/fizatezakoredumwo55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366374/normal_5fc8c62e6c1e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471703/normal_5ff00739e3981.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/jcNjfIK/kileluvorej.pdfIn PDF document text
    • http://dithetsen.xyz/50864282290qtyr2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463298/normal_603e57348a1d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_775103319f07462cbcca3a99b33b2faa.pdf?index=trueIn PDF document text
    • https://be8d9ae9-445e-4c8e-be9d-a08f5bb2c2ca.filesusr.com/ugd/8b97dd_ca0e0f84eae94794a07eaf90da4d8841.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 5420 bytes
SHA-256: 5a606a459b18aae81dac83a0d53071da85f99be3ca334b186c9769f4055e4223
font_01_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 12856 bytes
SHA-256: 8cf346fdd2d9e6d11df907344c0bccf5cf32f0740960d1ab1489f94aa33412c7
font_02_sfnt_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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