Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8c6e2315a4e8ca…

MALICIOUS

PDF

76.4 KB Created: 2021-03-16 01:57:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c573c7238da31e731fbcc472dda436cc SHA-1: 264cb6c106b0eff69e556b55b1f371e2569ab720 SHA-256: 6a8c6e2315a4e8cac1e8a6ddc0680458266d51538ec7b7f4c76a58d251f9ed81
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document attempting to lure users to external sites.

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://leonvi.ru/strik?utm_term=quimica+organica+definicion+corta PDF link annotation
    • http://arbitestpark.xyz/81902051090vgv1o.pdfIn PDF document text
    • https://cdn.sqhk.co/tifatuju/7tVibnh/iron_bottle_opener_anniversary.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/gdjMaZl/fetugup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_6046dc10447e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_6008d18b30024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418567/normal_5ffc03edbb386.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/multiplying_and_dividing_rational_expressions_practicem9q8l.pdfIn PDF document text
    • http://baltika-trans.com/vegapofezumid06ke9.pdfIn PDF document text
    • http://mobivegu.22web.org/ribiwubavupenoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5ff991eec0adf.pdfIn PDF document text
    • http://cleaner360.shop/tavoxujisepedytml.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fcd98d375065.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/ajejcgj/marvel_runaways_cast_season_2.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/ijJhehg/new_york_times_crossword_app_subscription.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwojojerat.rf.gd/37081434933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f85f11a8-31c9-42cd-a154-0b6fbd3681cb/the_missing_season_2_episode_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7adb108a-ea26-4c45-8485-cd2974fad2fb/how_to_prime_a_pellet_grill.pdfIn PDF document text
    • http://xelidev.rf.gd/laneraxofogalobido.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_off0000ea02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA02 5192 bytes
SHA-256: 8a141ffbc10f08d44175936be2fb12f2b71273f77edb442d0fcfdf4131a198e9
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 12548 bytes
SHA-256: 5cbe5246d9d2ea04379888260d3579ba330287068f3755c7d9d0e2d8da0e319c

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