Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c4cf8e7fdfb7c5…

MALICIOUS

PDF

76.8 KB Created: 2021-03-07 20:26:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 03bb84d94a93821b5228a92860eea0a3 SHA-1: 3790e4d8996ce2593fbb7ec67440e735a0a7722c SHA-256: 93c4cf8e7fdfb7c58dd13323da26eaac7adf3ed5670f8b44ea3a238fcdbd8102
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to contain keywords related to study guides, a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/wix?keyword=chapter+7+cells+study+guide+answers PDF link annotation
    • http://strgb2.ru/19293205452p5b4g.pdfIn PDF document text
    • http://soldatskaya6.ru/dezototikevgknvm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449768/normal_5fd13112def23.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/ifgdZ4K/julofuvubegotowetuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417122/normal_603085e480590.pdfIn PDF document text
    • http://cheapestshop.xyz/mamie_ouate_en_paposie_exploitation5dk93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_6028fbacf31bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_6008fcb9edcf6.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/jEhcjbe/85694821522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5ff48de62bcf6.pdfIn PDF document text
    • http://vienvozvrat.site/tivadopoxibebarunoberabux1mtcj.pdfIn PDF document text
    • http://alania365.ru/19131467845h22js.pdfIn PDF document text
    • http://bupro.asia/155087769322d597.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/oihvjbD/17366710660.pdfIn PDF document text
    • http://eeeeeyyy.space/mipalaganijoluvatonavph6h6.pdfIn PDF document text
    • http://agreevudb.rest/vukawipokexukepy1epz.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/kisivise.pdfIn PDF document text
    • http://tersq.space/ubisoft_report_bug_assassin_s_creed_odyssey4n22i.pdfIn PDF document text
    • https://cdn.sqhk.co/senagoxosog/jBjggeT/32293047994.pdfIn PDF document text
    • http://bunnygummy.ru/1304103841360ztl.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/jhidIu7/80547529003.pdfIn PDF document text
    • http://hotita.space/ninja_revenge_filmv4ejp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeborawaleko.atwebpages.com/holden_evening_prayer.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_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 5512 bytes
SHA-256: 3c71d555742028395ea506c41157f50aee14ff23fb4c5946963933315a5b1b6e
font_01_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 10204 bytes
SHA-256: e94d3944855a937889f03cef233e0ac45fd72a3bbb61e84c98635f296ea29f1e

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