Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec6335d561db5b1…

MALICIOUS

PDF

84.9 KB Created: 2021-04-01 16:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 93655998740633772d195db3ebf3c9cd SHA-1: 262e0ba07df14bb4f2935d662190f353a59638d9 SHA-256: cec6335d561db5b183cede9096194f2ab08d607af6d670ed0c4d009f539461b4
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one identified as a potential redirector for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=kyocera+duraforce+battery+replacement PDF link annotation
    • http://fubikopelemom.mypressonline.com/towigukajezexo.pdfIn PDF document text
    • http://christmas-gift.ru/balekosxz9p9.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/diicibD/22062335654.pdfIn PDF document text
    • http://kernig.pro/personajes_importantes_de_la_epoca_colonial_en_mexico1fnuf.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/dictionary_of_the_old_testament_historical_books.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446489/normal_602ad03002e73.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/56595397194.pdfIn PDF document text
    • http://emirofficialzm.com/65073162420vgtxv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_5fe85019326a3.pdfIn PDF document text
    • http://pshcomonhere.xyz/7840623365554jz3.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/A7ibphd/super_smash_bros_soccer.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/dOEjUZa/68317960927.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/bmOHYYe/gartner_symposium_2019_goa.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/iighPr2/gizoxugonaku.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/psychology_12th_edition_david_g._myers_c._nathan_dewall6xac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_6011b9597ef2f.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/WHhhfhd/nebixupat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368250/normal_5fc68f9828f28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_b0d6a90f3d2c43be8eac8a40210d7fcb.pdf?index=trueIn PDF document text
    • http://pijosufun.myartsonline.com/burumewefefomivevajowuk.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/how_to_hide_caller_id_on_your_phone.pdfIn PDF document text
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_3a3b5469adc6488d9447cf802f9616fe.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 5168 bytes
SHA-256: 39635f7d9e7f396f329f9831b9fca9f346d2ff9b5a612e12142991726a9cdbbc
font_01_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 11436 bytes
SHA-256: 47e5f50946d6f5eaaaec664baa0af29f6e09fb1c881de27795faa8bf018e541d
font_02_sfnt_off00013670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f