Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7f3872342d1f14…

MALICIOUS

PDF

64.2 KB Created: 2021-02-09 06:34:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22aab171c1d4cbab7365dfd70e86f57d SHA-1: ebb410c228a4861c83cfaac2e8c111d888ee13c1 SHA-256: 1a7f3872342d1f14b95d27c7df68d9406226d9ea6e5b175b7a7aaecac8456c64
166 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The numerous embedded URLs suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bologen.ru/aws?utm_term=campus+virtual+unah+plataforma PDF link annotation
    • https://cdn.sqhk.co/tategupet/idp7hjO/kigafepuzakamomijokip.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/ggE9GVo/26728950725.pdfIn PDF document text
    • https://cdn.sqhk.co/ninujamezol/aVjgMXA/37147651956.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/lidijalosog.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvezunotumu/xjjt8IH/planetary_times_astrology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370987/normal_60149f004ea9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386606/normal_5fc6978d18589.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hghmhht/forrester_cso_insights_2012.pdfIn PDF document text
    • http://free-at.pro/funny_sound_effects_app_for_pct3hxh.pdfIn PDF document text
    • http://justamorem.com/notify_fitness_prohmn0f.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/86ec0e0a122535.pdfIn PDF document text
    • https://tevaxuxelajuri.weebly.com/uploads/1/3/2/7/132712575/vebamevabonujiv.pdfIn PDF document text
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/c045ea7548b.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/goxiwerabogem.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_off0000bfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE5 5108 bytes
SHA-256: cbbce40fa8f8e247ee0f17825fc14728161857f9c44c12a1ddd2b51b23589f33
font_01_sfnt_off0000d11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11C 10412 bytes
SHA-256: ddd4ddeaeb9c0485aeb36b7499e33268c842a10c92cc33a63ecfd3fd1a6c447d

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