Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b94dd352b4a40d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-06 19:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 830677a6b7860ee777175cfc232be198 SHA-1: c3a7577559fbc64d0856f939550778f37eca6ef6 SHA-256: 87b94dd352b4a40da99e4b19c029d3d7202b0528a9f7dabef943216de28871a3
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a potential phishing or malware distribution vehicle. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure to a malicious site.

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://kuzutuzo.ru/strik?utm_term=how+to+make+an+introduction+about+myself PDF link annotation
    • http://avto-document.site/putinavovudb5k7f.pdfIn PDF document text
    • http://tixivepemom.22web.org/behringer_b1800x_pro.pdfIn PDF document text
    • http://mozejuvedum.22web.org/the_wheel_of_time_amazon_air_date.pdfIn PDF document text
    • http://vashobereg.com/wojetikatulurovixuvuvex2zts.pdfIn PDF document text
    • http://mon-cmbretagne.com/43151919334826e3.pdfIn PDF document text
    • http://minomesiguziv.22web.org/wamosilivetipekesalaw.pdfIn PDF document text
    • http://tihefers.online/boruto_episode_41_english_subi5oh9.pdfIn PDF document text
    • http://mon-cmbretagne.com/viwilegmgpjh.pdfIn PDF document text
    • http://everydays.space/xereraxazif94t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a871539-7782-4abb-a7c6-8f690215ed25/nlp_techniques_for_success.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c39dea-574c-40d0-b3a2-f0dcc056f1be/zibazesibozasesa.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/rhetorical_situation_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d911726c-a392-475f-95f1-18b957b06210/phrasal_verbs_esl_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a1f207-9450-4294-8a33-a28a5cc0787a/apc_back-ups_pro_1500_battery_replacement_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/tiligafeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ee526f-1674-43c2-9b89-0f7e7d129125/99191296505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab14f74-b59f-421c-b00e-6bc40a9e9573/homelite_xl_automatic_carburetor.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/vpn_untuk_game_online.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_off0000e9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E8 5528 bytes
SHA-256: c3b6db6d446ee0acf805b3d454404a6544ca9cf01f9a72abd32ceed99e52a915
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 10000 bytes
SHA-256: fb11568cc057f704abbdf73fbade71b2dd00b77120bff0b31738e58e5b3c6672

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