Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe221b959e42bb6…

MALICIOUS

PDF

80.9 KB Created: 2021-04-09 03:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3ec755ab9fc5904a8424ccfbcbf4bc4e SHA-1: 2d925c959eef02a8f4c7d0b811daa638929e3ec3 SHA-256: dfe221b959e42bb6242d1707a8781eb32be4fd853a7bef90e150f1258b27d882
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs, including one pointing to 'jumiwimov.ru', suggesting it's designed to redirect users to potentially harmful websites. The PDF's structure and the presence of embedded links indicate a phishing or malware distribution attempt, likely leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=ecers-r+book+online PDF link annotation
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/bewonib.pdfIn PDF document text
    • https://cdn.sqhk.co/teforoke/hbgcgfu/durikabakufisiwezopura.pdfIn PDF document text
    • http://zofunubesosena.mypressonline.com/25866447436.pdfIn PDF document text
    • http://rawiduti.medianewsonline.com/remington_11-87_rifled_barrel.pdfIn PDF document text
    • https://xovamiwif.weebly.com/uploads/1/3/4/0/134096018/zupipojuwikovenusupo.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/931efd9ea39886f.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/71177282551.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/065c7756086f.pdfIn PDF document text
    • http://vedivux.mygamesonline.org/kewawapulasopaxakagej.pdfIn PDF document text
    • http://manovina.mypressonline.com/mogagi.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/hyuhhZY/35010152779.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/Y5Khdif/suvodasumorerudaxolep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/87981200275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f458edcf-87b0-4a5b-9ae6-ee999fbc895a/ziweniw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f8b9f2-f652-4323-841e-76b66367636c/20805319927.pdfIn PDF document text
    • http://peledopa.myartsonline.com/kiduninomuluwetijamex.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/school_certificate_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d339f0-c007-47b4-bbc4-6ee6140cbc83/tone_pro_lg_p760_precio_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4ba4b2-1b8f-4e65-92a0-566660e66297/the_bfg_book_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b9e06d9-6bc9-41ff-81c4-ebe6f45c4818/whats_another_synonym_for_violent.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/xomeku.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_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 4776 bytes
SHA-256: c062799748b8c8d2151c22a24c98a9de573caf609595ec03538cb9fea2e9fb13
font_01_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 10948 bytes
SHA-256: 95fe6ad4c9f0b2a33a650bf76dd806e1155abff8f3a38d47449f4c20482b840d

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