Malicious PDF — malware analysis report

Static analysis result for SHA-256 4493f33b2693d7a2…

MALICIOUS

PDF

76.7 KB Created: 2021-02-24 08:37:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f6cfadb1d957fec3afdebd345abe1145 SHA-1: b6e59b03f092c0367648cf394d87952de1ee6928 SHA-256: 4493f33b2693d7a298485c6bd1fe4f69170d0807186dc95cc5f06053fba9a397
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically pointing to a suspicious domain 'baarspo.ru' that is likely used to host malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=hp%20probook%206470b%20i5%203320m%20specs PDF link annotation
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/bafuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_60252fc7612ec.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/tufosivanesavul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5ff662a9b6b2a.pdfIn PDF document text
    • https://litodamun.weebly.com/uploads/1/3/4/7/134710511/fff2135.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_6008aa0e874f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_6025f0741f843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489404/normal_5fd1a330aafb0.pdfIn PDF document text
    • https://wawotisusuwo.weebly.com/uploads/1/3/2/7/132741293/1b88407b.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/detavuf-nujin-madebet-xotiwapigewu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fc7392bc020a.pdfIn PDF document text
    • https://welokanuxutumo.weebly.com/uploads/1/3/4/0/134017703/rukujokapabu.pdfIn PDF document text
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/noxiwabutiwat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/kaththi_movie_bgm_theme_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/kedapegobowufobavukuguwo.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/bumawuxaxatak.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/anno_1404_guide_continuous_game.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/isi_web_of_knowledge_author_citation_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/rebitonorasakosadegewip.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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 5888 bytes
SHA-256: 2ad0b0c91465229ce0fd5cb2af07b326f8b7e53411d5c4ecfe8c18023a9a0cf0
font_01_sfnt_off0000f405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 15436 bytes
SHA-256: f820af23a4b69bca2ff84c996af106893e741f9da284048ec9d49f1c0fc3a7f4

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