Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd83340a9cb8e7f…

MALICIOUS

PDF

86.2 KB Created: 2021-03-16 03:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6f88426e198a72330567f6b205ba6cb SHA-1: 15beac6c118a6b98666a6cf1bfbf308fe8796bae SHA-256: 6bd83340a9cb8e7f88b4f8a4ccf6234164b8bcd5f108670cabd5961245c5c35e
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that lead to link farms and disposable hosting, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=computing+essentials+2017+free+download
    • https://cdn.sqhk.co/nububufi/ha4giUm/nilofom.pdf
    • http://discount50.pro/96296631980csgfg.pdf
    • https://static.s123-cdn-static.com/uploads/4401559/normal_5fe24baee9f1d.pdf
    • http://spencermcman.us/tomodachi_collection_english_romlt0vy.pdf
    • http://ig-about.net/jotuzejosekemalalorbnyy4.pdf
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/3726145.pdf
    • https://cdn.sqhk.co/kapipota/hgLghkp/japanese_auto_parts_mcalpine_street_wigram_christchurch.pdf
    • https://sezorataxij.weebly.com/uploads/1/3/4/6/134600708/d3974ef3d42707f.pdf
    • https://cdn-cms.f-static.net/uploads/4393635/normal_601dc836c7c4f.pdf
    • https://static.s123-cdn-static.com/uploads/4408462/normal_5ffcd3e646c6f.pdf
    • https://cdn.sqhk.co/wefenosefob/aheae5J/19375883386.pdf
    • http://lasns.fun/tabapigopodadititinelonelxqm.pdf
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/resebimavepozuvid.pdf
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/fuzalaluwoteluka.pdf
    • https://cdn-cms.f-static.net/uploads/4379846/normal_603a712661ad5.pdf
    • http://get3creditscores.info/xoxoxebabo1xah.pdf
    • http://dresdenpharma.ru/anjaniputra_kannada_song0us5x.pdf
    • https://cdn.sqhk.co/xovopebe/8jep3hd/lovebug_jonas_brothers_sheet_music.pdf
    • https://cdn-cms.f-static.net/uploads/4409628/normal_604a930ed74c0.pdf
    • http://nonretloli.site/pumetodepaxoletwywnp.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a5b378ce-8702-4255-be12-0238657ddd8b/bob_evans_menu.pdf
    • https://uploads.strikinglycdn.com/files/06c48b11-c1f8-4b57-a4d5-a2a671afc821/how_to_clean_salt_cell_pentair.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_off00011032.bin
a65405e9c869461b7ba424c23b428ff0755f47c4efb06eecb61b558b26092c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 5764 bytes
font_01_sfnt_off000123db.bin
60925cd18b837fa0652f520361bca4e9797765213d64efa27ad0319775be3be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123DB 11592 bytes

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