Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c4f0b33da097e7…

MALICIOUS

PDF

68.5 KB Created: 2021-04-17 05:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c08f3bdbc9dd8c2612171138bb98aa7 SHA-1: 2f2636b76adaf7812afffecb33279ba66b0c7e27 SHA-256: b2c4f0b33da097e76ff1b031e01abdafb555a135d14c93fa8905c4be9c46f928
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains an embedded URL that redirects to zajinet.ru, likely serving as a lure for users. The PDF structure and embedded content suggest it's part of a phishing campaign, potentially using a document lure to trick users into clicking the malicious link.

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://zajinet.ru/strik?utm_term=alfred%2527s+group+piano+for+adults+book+1+ebook
    • https://cdn-cms.f-static.net/uploads/4462696/normal_5fe6196440556.pdf
    • https://static.s123-cdn-static.com/uploads/4389361/normal_5ff1213342195.pdf
    • https://cdn-cms.f-static.net/uploads/4451945/normal_6029dac6577ea.pdf
    • https://cdn-cms.f-static.net/uploads/4454813/normal_603be8b3c298b.pdf
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5fc7d33c39615.pdf
    • https://cdn-cms.f-static.net/uploads/4410985/normal_601e9563b06d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f81d2d60-bdad-4818-9ce2-2829fd0a5a9b/45567566070.pdf
    • http://renirorevebu.epizy.com/geometric_distribution_problems_and_solutions.pdf
    • https://uploads.strikinglycdn.com/files/8869af2b-ff5a-4849-b3be-2d948bd022f8/research_plan_sample_for_scholarship.pdf
    • http://zezajezo.epizy.com/siwoxikeketomutujepeseve.pdf
    • https://uploads.strikinglycdn.com/files/cd2960f1-d678-4737-aa24-aa633d54773e/7272419395.pdf
    • https://12c21f6a-324e-488c-af83-7e1076049286.filesusr.com/ugd/e84f25_b002fa292fb544d8ac8a85b4674d25d0.pdf?index=true
    • https://acda325f-ee3b-40e4-882f-fabc489a6840.filesusr.com/ugd/23b3d3_603337abbb364641bcb4ef605d1128f6.pdf?index=true
    • https://s3.amazonaws.com/mubemutolewe/birigazeri.pdf
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_4e7be448098648489904e2fd5952e82a.pdf?index=true
    • https://s3.amazonaws.com/zedilegol/tuwuwibimu.pdf
    • http://dafoxakonefa.epizy.com/lowanojosaxowewub.pdf
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_f61688fe59b4496b8cbc2ba51da73a15.pdf?index=true
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_5134b4c733fe41d4a22327dca37e45a7.pdf?index=true
    • https://s3.amazonaws.com/kitakilesa/grade_3_maths_worksheets_printable.pdf
    • https://s3.amazonaws.com/kukupunopedon/alaipayuthey_movie_mp4_songs_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbca.bin
610715e72be7b201da13f25991dec2d957e7833ea7320d01605b1c13bdd81d3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCA 5488 bytes
font_01_sfnt_off0000de8f.bin
6f5771ebb1137152e472a9ad5290ffb8c1f39cbe73b2d0830d5c415e17c10959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 10604 bytes

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