Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0a895c6c4f62af…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 19:15:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc8e2b260d507f521b49d3a70076afda SHA-1: bea74c41256499b4277d08aa4bfd54c37a6891fb SHA-256: fb0a895c6c4f62af2453b2acc4fbfea073cb749aa7d49c545ea8b2c4ae18e1d1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it is part of a link farm designed to host numerous external PDFs. The embedded URLs, such as 'https://jumiwimov.ru/award?keyword=callidus+commissions+pdf', suggest an attempt to direct users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=callidus+commissions+pdf
    • http://masito.space/the_heart_of_betrayal_vk0z5a6.pdf
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/bigab-fadowamato.pdf
    • https://cdn-cms.f-static.net/uploads/4450145/normal_603a79a02e88d.pdf
    • https://cdn.sqhk.co/refowofiros/icbFzid/lifasufiditagasavez.pdf
    • https://cdn.sqhk.co/noxisoture/0ejhiZm/wallpaper_among_us_gratis_pc_ultima_version.pdf
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/db9e9b006.pdf
    • https://cdn.sqhk.co/vagizabibo/bjcgehe/jovorozidokofene.pdf
    • https://static.s123-cdn-static.com/uploads/4406168/normal_600302bfca2d4.pdf
    • https://cdn.sqhk.co/zezetemirag/hdHicZb/65919296370.pdf
    • https://mojivuza.weebly.com/uploads/1/3/0/7/130775228/81c5ab.pdf
    • http://qrastenmap.online/wiserezcirp.pdf
    • http://istra-backwater.ru/wejolodegalidadunopebagud5xyt.pdf
    • https://cdn-cms.f-static.net/uploads/4452839/normal_604e46e38d302.pdf
    • http://basiditdcf.space/dirigejidabufofuletawutow2s3wj.pdf
    • https://sesanejaw.weebly.com/uploads/1/3/1/4/131407178/wunibufugi.pdf
    • https://cdn.sqhk.co/miweguzeg/oSHghgO/atom_code_editor_download_mac.pdf
    • https://static.s123-cdn-static.com/uploads/4409250/normal_60006500201d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dagasopones/machiavelli_discourses_book_1_summary.pdf
    • https://s3.amazonaws.com/povodijirig/human_resource_management_powerpoint_template_free.pdf
    • https://s3.amazonaws.com/kaxukok/denedoza.pdf
    • https://s3.amazonaws.com/mokixetat/evidence_of_evolution_answer_key_biology.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_off0000f1b2.bin
9235deb373ef97be06349a47ff92e840c7cb18b10decdbf70d79d8f250890a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 5108 bytes
font_01_sfnt_off00010301.bin
606b73e91e14900b1959bd8904be0b677769f75c208b6b11996ab96780580143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 11524 bytes

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