Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6ba01b3aa8d61a…

MALICIOUS

PDF

69.6 KB Created: 2021-06-05 11:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3bcb2854451308bc6c8e81304531180d SHA-1: 591d522b9d6158230702ed5cdb3aabf063fa953c SHA-256: dc6ba01b3aa8d61a0aa116b336ca7d4a611527f6cd4673f9b2bc869993144d90
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one pointing to a link farm designed to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the malicious intent by identifying a pattern of small PDFs acting as link farms on disposable hosting. No scripts were extracted from this sample.

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://huntic.ru/pbw?utm_term=mario+vs+donkey+kong+nes+online+unblocked PDF link annotation
    • https://mobuzuwatajol.weebly.com/uploads/1/3/4/3/134310732/xomobowotijamilutefa.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/tuluranalud-nigabelazuko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fce5bb6afa14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5ffb24b6ad067.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4443357/normal_60b686eb0ebce.pdfIn PDF document text
    • https://wegeduvoxu.weebly.com/uploads/1/3/4/6/134634177/2266090.pdfIn PDF document text
    • https://bupebilonozopi.weebly.com/uploads/1/3/4/8/134861312/fa77b7513ee64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_6027674072b20.pdfIn PDF document text
    • https://desaboros.weebly.com/uploads/1/3/5/4/135400021/138076047b9.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/4cbb655e353e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_601af098a90c4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4409813/normal_60b1d144e29a7.pdfIn PDF document text
    • https://fifusikusivupe.weebly.com/uploads/1/3/4/6/134638905/muzodidagowugud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamotekegopa.pbworks.com/w/file/fetch/144446547/twilight_avengers_crossover_quotev.pdfIn PDF document text
    • http://nugewil.pbworks.com/w/file/fetch/144611775/how_do_you_change_the_battery_in_a_timex_ironman_watch.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416577/night_owls_de_jenn_bennett_sinopsis.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/greatest_common_factor_worksheet_6th_grade.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/fiche_fraction_cm1.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411483/76558110092.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_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 5476 bytes
SHA-256: 9fd160db1b9b11dcdacf1b29f1edd307b7839db7f1739575f8cf49fe4c1fa53f
font_01_sfnt_off0000e4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DE 10908 bytes
SHA-256: 3d450412ca5f5b22551d377f2db39539d02bfe148fe5cd72fa06af251b3f6c7b

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