Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bf88da4e2aa3af…

MALICIOUS

PDF

70.6 KB Created: 2021-03-22 06:01:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 403b322e5bb6b19d168f6d2d72e40070 SHA-1: 78cffc5d68cee0f212946fa2e6d3e2a14f6a6fea SHA-256: 87bf88da4e2aa3afab20f5d73211b4a2743a077c26746704bbef1265b4460c97
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or malware delivery. The document body, though partially corrupted, references a search query for a PDF, suggesting a pretext for the malicious link.

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://kuzutuzo.ru/award?keyword=eduardo+galeano+cerrado+por+futbol+pdf+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454988/normal_600c64d6308c7.pdfIn PDF document text
    • https://cdn.sqhk.co/faruzikako/gijcgft/pick_me_up_similar_gamestop_pickup_near.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366028/normal_5fcb485f27b1a.pdfIn PDF document text
    • http://vowavosudepomu.iblogger.org/54623172280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474169/normal_6049e42d5519d.pdfIn PDF document text
    • http://jedufozares.22web.org/xidalafelitekizorevaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/medasozuf/3hfhanE/way_of_retribution_awakening_apk_obb.pdfIn PDF document text
    • http://thechambre.xyz/909557567399u2go.pdfIn PDF document text
    • http://mexicotop.xyz/lyndall_urwick_proceso_administrativobke60.pdfIn PDF document text
    • http://mesretly.xyz/40383099764da7jv.pdfIn PDF document text
    • http://maripifedama.22web.org/91071880147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bee36e7-39a9-4766-9bd8-7779a71edc44/toro_weed_wacker_starts_then_dies.pdfIn PDF document text
    • http://vobisobopimab.epizy.com/attico_chassot.pdfIn PDF document text
    • http://vufebadavoga.epizy.com/guided_transmission_media_in_computer_networks_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e3be360-c0c6-45e0-adf2-5fe66c02d421/apple_iphone_5_price_in_india_2019.pdfIn PDF document text
    • http://lebekuwawelu.epizy.com/xomuveguva.pdfIn PDF document text
    • http://gijewitog.rf.gd/36143951579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e5a50e-cd70-4b95-8b33-dad19dac2715/kukukirowoxaburex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc4d7f4-2c48-45c3-9e6b-07a92a2af4a4/routes_of_persuasion_definition.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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 5420 bytes
SHA-256: e4068ea8e841e752a7b60ffee3c9fc4045f5d2fcf5bdefbf9c3eb43a75bdae12
font_01_sfnt_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 11292 bytes
SHA-256: 0461078d6b9a537cb98d324a366516b77f24b10ebfad340b469566fb540c8f6c

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