Malicious PDF — malware analysis report

Static analysis result for SHA-256 33298ed4cf651e9c…

MALICIOUS

PDF

91.1 KB Created: 2021-03-28 01:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82de67b9620b7c37ad4ffef98931d999 SHA-1: 3c8a423cbccfd81a4d7ed9f487fa560c6acb48f1 SHA-256: 33298ed4cf651e9cce42e5e524ee12b966d32f5b9dd240ecb84560a057e55de3
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though garbled, references printer troubleshooting, a common lure for technical support scams or malware delivery.

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://xezojetit.ru/strik?utm_term=how+do+you+fix+a+carriage+jam+on+a+hp+printer
    • http://fringigejy.site/juxikuwasazujabelubupends2r.pdf
    • http://lnstagramcopyrightmanagement.com/proto_reflex_rail_reviewakjly.pdf
    • http://gekenig.mywebcommunity.org/53527919891.pdf
    • http://kazaxukiga.getenjoyment.net/compound_bilingualism_and_coordinate_bilingualism.pdf
    • http://airbin.top/farewell_my_lovely_movie49n3m.pdf
    • http://fejekadiwoxobiz.getenjoyment.net/a_handbook_of_roman_art.pdf
    • http://sexedate69.site/negibam07zm5.pdf
    • http://storeyou.store/cpa_requirements_2017utdnk.pdf
    • https://cdn.sqhk.co/taxeseta/hbF4a9U/top_10_everything_2018.pdf
    • https://cdn.sqhk.co/gumakulex/hM3Zjdk/ocean_survival_3d_2_game_download.pdf
    • http://ig-support-service.com/gunojekf0wh.pdf
    • http://eeeeeyyy.space/wiwoke4a7h5.pdf
    • http://nonowun.mywebcommunity.org/brihaspativar_vrat_katha_book_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fikelamizogu.myartsonline.com/64064571906.pdf
    • http://koriwironawuva.myartsonline.com/99176137800.pdf
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_3e1e32d514b146c0afaad474fb5e8aa3.pdf?index=true
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_9aae586ffd984c009a73d1aa6579868d.pdf?index=true
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_e72e27ab73d84c3e805bc9405a01e9c4.pdf?index=true
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_d204f531e24449999add45a8e5570135.pdf?index=true
    • http://kojenixerog.myartsonline.com/46009828899.pdf
    • http://vakogez.myartsonline.com/the_bread_bakers_apprentice_mastering_the_art_of_extraordinary_bread_by_peter_reinhart.pdf
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_9c70097590f9420395ca1b209278cbd0.pdf?index=true
    • 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_off00012585.bin
f37b1e25f8b0d6e40fe2a00d09627c6a7d710b6b5863b892c58365ca5cf9ec77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 5656 bytes
font_01_sfnt_off000138bf.bin
3f5f66eab1257423ea63dc3be0221c5ea36a42f8b72ce2cc27af75a68f1f91bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138BF 11228 bytes

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