Malicious PDF — malware analysis report

Static analysis result for SHA-256 8673a3bf54097c21…

MALICIOUS

PDF

78.1 KB Created: 2021-06-07 23:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b49b797a5c890779a2329daba612b97 SHA-1: cf2d98f535610a4751f78a7cdbe3973421860c32 SHA-256: 8673a3bf54097c21400b01e7e81026cfda426410db0d8957d1ac07edaa888181
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to a 'Fluke 754 documenting process calibrator datasheet', suggesting a lure to disguise the malicious intent. The presence of numerous external URLs, including one pointing to 'golowaki.ru', strongly suggests the document is designed to redirect users to malicious sites. No scripts were extracted from this sample, but the overall structure and URL findings point to a phishing attack.

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://golowaki.ru/123?utm_term=fluke+754+documenting+process+calibrator+datasheet
    • https://xiruzavaxukegaf.weebly.com/uploads/1/3/5/3/135324830/badeg.pdf
    • https://noruwapawufibem.weebly.com/uploads/1/3/0/9/130969999/sofaforuna.pdf
    • https://cdn-cms.f-static.net/uploads/4460966/normal_601ce1ee2a161.pdf
    • https://static.s123-cdn-static.com/uploads/4387035/normal_5ff33d08c9d4e.pdf
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/zoxesowaxawo-muxenudapirari-perobib.pdf
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5fcafc68c3247.pdf
    • https://wadagubabu.weebly.com/uploads/1/3/4/7/134709622/42620d.pdf
    • https://static.s123-cdn-static.com/uploads/4367305/normal_5fe1a1a34104b.pdf
    • https://cdn-cms.f-static.net/uploads/4501029/normal_6020a33993566.pdf
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/lemebosamugewuvobov.pdf
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fcef4b1cf5ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wojipag.pbworks.com/w/file/fetch/144421245/nogiwipemalok.pdf
    • http://pigedigasexu.pbworks.com/w/file/fetch/144504252/kazelidejep.pdf
    • http://paderukut.pbworks.com/f/59418370352.pdf
    • http://kolelulu.pbworks.com/f/86572746064.pdf
    • http://jananevava.pbworks.com/f/acids_bases_and_salts_class_7_worksheet_with_answers.pdf
    • http://jujirafamena.pbworks.com/w/file/fetch/144654810/what_type_of_business_structure_is_nike.pdf
    • http://nipekari.pbworks.com/f/how_do_you_fix_no_sound_on_iphone_7.pdf
    • http://dejimebez.pbworks.com/w/file/fetch/144427365/is_space_hulk_deathwing_worth_it.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_off0000ef44.bin
202081a35abd0eeaac288a2dbae98ed598d3acb07a75fc376e5703626a259f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 5936 bytes
font_01_sfnt_off00010365.bin
2abbc4eeae28b52f767f6e4c9438923d88190855fc5a4425817d64e5e5fe1239		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10365 11640 bytes

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