Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5917c814d455e8…

MALICIOUS

PDF

147.2 KB Created: 2021-03-21 06:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 01ef5ded27cdc7e903496b35040c8573 SHA-1: bc891d8a1d906ed0bced5cdce7a22e4eea7ea447 SHA-256: 6b5917c814d455e805b5bb9f031bea265c726733479a565be078ed93f4b2acd5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/award?keyword=waiting+for+godot+pdf+analysis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420767/normal_6032e5f6965a8.pdfIn PDF document text
    • http://webcam-model.online/566743902047nhbz.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/ixjjArd/home_manager_jobs_liverpool.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/388311372643isul.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/hdifjcA/download_game_snake_zone_worm_io.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_6034679f6e4f0.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/higfjgh/sedofepenazuvid.pdfIn PDF document text
    • http://bristol-yalta.run/the_magicians_book_2_summarywq3jr.pdfIn PDF document text
    • https://cdn.sqhk.co/jilazelitor/GJHggqg/esma_structured_ucits_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/sevidekepige/jHhf6iI/faduwu.pdfIn PDF document text
    • http://goodsun.space/24307042008hhmi2.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/9ad4aef9-5e9d-462d-a980-1fa52f23be92/muluda.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/alan_watts_audiobook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/pomanolixiponofugolibuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fffb653b-6e1e-4859-8a69-137b1829a755/2_step_inequality_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/21082061169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db179bdf-4040-44a0-8d0b-8d9ee1ada234/argumentative_essay_prompts_for_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/upsc_model_answer_sheet.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_off00020262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20262 5324 bytes
SHA-256: 125f549d92119b020821560127f5f50c1cb626b91ccd4af44e1143f1dbc56553
font_01_sfnt_off000214a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214A6 14288 bytes
SHA-256: fb63c3117a437d878f98ebe25a59bc9dadcd79fb6c0197539ae6bb7dba9a0467

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