Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe80b9003a198d69…

MALICIOUS

PDF

72.6 KB Created: 2021-02-06 09:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: d4fcd00d7e6f526b9507bae19d5b8afc SHA-1: f466ba9271543f5574b40cc55c3cc9f413f1e993 SHA-256: fe80b9003a198d69b12a01654a3bee305b8dcdc6993a6b8701b9811cb2f05711
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic further support this, pointing towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/aws?utm_term=irda+question+paper+with+answer+2016 PDF link annotation
    • https://cdn.sqhk.co/laripikiwafo/K4hfzmB/judekevuvebugovulolas.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/gcEhgii/toggle_on_off_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/biijdlm/75886299638.pdfIn PDF document text
    • https://sezulozag.weebly.com/uploads/1/3/0/9/130969806/2501815.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/4wigd4G/95091678177.pdfIn PDF document text
    • http://timelessdecorum.com/hamburger_menu_xamarin_forms_samplea3lx6.pdfIn PDF document text
    • https://biwasigefo.weebly.com/uploads/1/3/1/3/131398444/wamoxezutokufa.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/kenages.pdfIn PDF document text
    • http://prequester.online/77925424895nh60e.pdfIn PDF document text
    • http://daating19.site/kigiretitawifeleuvjoc.pdfIn PDF document text
    • https://cdn.sqhk.co/supetuzitepi/jhcjhGe/origami_owl_disney_2020.pdfIn PDF document text
    • https://xobagesimijuvu.weebly.com/uploads/1/3/0/7/130776740/jugereb-pinomoxel.pdfIn PDF document text
    • http://znakomstva18x.site/nukelekikafezlkb.pdfIn PDF document text
    • https://cdn.sqhk.co/bipukawu/kTjftgf/titan_quest_builds_2020.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/la_novella_degli_scacchi_paginerdw8o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dobupefibukin.epizy.com/zedufogeze.pdfIn PDF document text
    • http://kuxomexepus.epizy.com/sanenesinenenononilufufu.pdfIn PDF document text
    • http://pavebutom.epizy.com/ex_calling_video.pdfIn PDF document text
    • http://tirosonitagaxe.rf.gd/scary_clown_pumpkin_carving_templates.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_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 5652 bytes
SHA-256: cbbb4de06e0ad621c5dc7da4c6b6545aac4612d6ae25e3017b2cdbfd5ef3d706
font_01_sfnt_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 10696 bytes
SHA-256: 7b3dac944fc8a6f73af1cc349919f3f40006bbd2554376c66f442e8d25e09370

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