Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5c06b3c0e49498…

MALICIOUS

PDF

78.3 KB Created: 2021-03-31 15:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7ba69aabbd5fdddcd6b6457e2c6f0a15 SHA-1: 59b8860e8d360bd2387e7e814468853dddd206ac SHA-256: 2f5c06b3c0e494981b21bdff75da3d7978bd9b0da1149217b88f8a3546191238
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains external URIs and is part of a link farm hosted on disposable domains, suggesting a tactic to manipulate search engine results or distribute malicious links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/award?keyword=gallbladder+sludge+diet+pdf PDF link annotation
    • http://thepropheticapp.com/39319702155fhm36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403259/normal_6009afc24459e.pdfIn PDF document text
    • https://cdn.sqhk.co/wazofovam/iidhb2G/spin_the_bottle_free_online_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5fcf7309e98bc.pdfIn PDF document text
    • http://goldalbum.ru/logawyxaa3.pdfIn PDF document text
    • http://kungfumalibu.com/mizonewoe6ri6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_604d66ef880e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404293/normal_601d7cd151d55.pdfIn PDF document text
    • http://ketrovk.xyz/861539955579zu0i.pdfIn PDF document text
    • http://opensol.xyz/skullcandy_plyr_1_drivers7mnp7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482018/normal_6002214fe4412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_5fe73b4fc4860.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/i7Fijjg/ford_racing_aluminum_short_block.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_602c83201a58b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366369/normal_604a406717dd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_604e6890db9f0.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/hgsRgi2/xatanodivevumopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6444d6-e2ce-4ec2-84a3-f7bb7b681397/80127930490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c5a1f4-94bd-48b1-99cb-f16f90d6d4b4/free_romance_novels_online.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/boolean_algebra_simplification_problems_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/depoxogifibuxobupekema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4307c3-20dd-4796-987f-d376755aa889/shark_sc630_portable_steam_pocket_handheld_steam_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cabe329-ea12-4498-bba3-1d160af4c316/french_grammar_practice_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01109ec7-d169-420f-84e9-4f16f061a286/55138915597.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_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 5380 bytes
SHA-256: 673be8acea1201e3baf40e4e0a7b30a3dbf718f60d4879bf2c834cdbf1c0d6fe
font_01_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 10852 bytes
SHA-256: c63ea72d45c088dc8e0bd09e94de0712ad1203d4f9a3ef671727a0057e5bd3c5

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