Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4042036290528f…

MALICIOUS

PDF

92.2 KB Created: 2021-02-13 13:33:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 1735646f73b7d6dd483f5d2a13b222bc SHA-1: b83a483e9d427d5e4ac59f0317763fe8ec3de14a SHA-256: 7b4042036290528f2c7f30041624b6649239147be7218eddb6b42125d56e5590
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=the+power+of+vulnerability+teachings+on+authenticity+connection+and+courage+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409114/normal_5fc7b53f8bd00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411708/normal_5ffc593644189.pdfIn PDF document text
    • http://paksorond.xyz/minecraft_banner_designs_guide3sqfi.pdfIn PDF document text
    • http://iwhite.space/dirigifixjnrt.pdfIn PDF document text
    • https://rizegenaw.weebly.com/uploads/1/3/4/1/134108854/fabilimolag.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/mafejibonerukaf-dozosipav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_5fdbf55b373d9.pdfIn PDF document text
    • http://nanolenka.xyz/70016077841fynzs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60196adbe3003.pdfIn PDF document text
    • http://astropsychology.site/best_netflix_s_october_2018wru8x.pdfIn PDF document text
    • http://milanomoda-italy.site/amway_atmosphere_skyl1xli.pdfIn PDF document text
    • http://alania365.ru/67155864444q9x1.pdfIn PDF document text
    • http://risurevisawibe.iblogger.org/bisonapivo.pdfIn PDF document text
    • http://hookup671.site/davenaradetuvabenupexiguwx1u8w.pdfIn PDF document text
    • http://jumbochecker.com/partition_que_vive_mon_me__te_loueroalpi.pdfIn PDF document text
    • http://antonioit.space/8541120025508lsq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuguwusilabibax.epizy.com/30149669044.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_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 5760 bytes
SHA-256: ad562fa5487676eac7a291284bd5d3552666784f88798bd0141f639c131d491b
font_01_sfnt_off00013b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6F 11460 bytes
SHA-256: 64d688d81d3b0d736233a7aa19195a3b873019144ff8ce627c7a69c2758702a3

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