Malicious PDF — malware analysis report

Static analysis result for SHA-256 330b4f30b1d17310…

MALICIOUS

PDF

76.5 KB Created: 2021-04-08 16:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba46c631c79ba5255f112f709d1a968d SHA-1: 4c415a27b0f0ced0562dcf837b6073321a765438 SHA-256: 330b4f30b1d173102427e12039c64347983a50548b2308daf0095a3d080e8102
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=sim+card+adapter+template
    • http://soul-felt.com/blogger_collaboration_contract_template6t8u6.pdf
    • http://ecoterritory.store/ge_ultra_pro_universal_remote_codes_listomff8.pdf
    • https://cdn.sqhk.co/vabalogu/i6FmjvM/free_weight_watchers_points_tracker_template.pdf
    • https://cdn-cms.f-static.net/uploads/4410986/normal_6016a8356b7a8.pdf
    • https://cdn.sqhk.co/gukisafuw/f0Oxejb/prank_sound_effect.pdf
    • http://badgesverified.com/38593239754y7t7s.pdf
    • https://wagizubim.weebly.com/uploads/1/3/4/4/134470033/pidemanevagefanomoxa.pdf
    • https://kominuxopexazi.weebly.com/uploads/1/3/0/8/130814675/mosugesejapa-xifunonume.pdf
    • https://static.s123-cdn-static.com/uploads/4477164/normal_6009280a7e027.pdf
    • https://static.s123-cdn-static.com/uploads/4378404/normal_5ff5bf7002fe7.pdf
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/6714543.pdf
    • http://forecast.bet/military_athlete_ruck_based_selection_program9jl4i.pdf
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5ff44e1f557bb.pdf
    • http://winclean-shop.space/manual_de_estructuras_ilustradozr49w.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_3aa9904de14d41d1be08a938b934adb2.pdf?index=true
    • https://2fe0a9f4-4d23-48c4-8711-d5fb25093877.filesusr.com/ugd/683a75_8bbdf974dc7d43378501fa6c62fe8054.pdf?index=true
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_195220bf5c2f46f28661074ab4bae144.pdf?index=true
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_0b66ee8629f5432594d707b511baaa5d.pdf?index=true
    • https://s3.amazonaws.com/wemazun/juzofafexitedatuxil.pdf
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_6fb4004378a44e349a79ebaa92979871.pdf?index=true
    • https://s3.amazonaws.com/damerirazib/holt_geometry_workbook_answers.pdf
    • https://s3.amazonaws.com/naxozelozude/cameraman_gangatho_rambabu_movie_songs_telugu.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_off0000ef35.bin
bd5f10c0955f85ee618b0f8aee998404becd9100822281bd4cb86f5726e43b54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 5144 bytes
font_01_sfnt_off0001009c.bin
25e96732220176ed9a53582dfebd2994551041627b478ff1fe7d95e48b0d8186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 10412 bytes

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