Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4be7367b7c0f67b…

MALICIOUS

PDF

76.4 KB Created: 2021-03-28 10:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a222fa5728003dbfebe46fda49d6e2f0 SHA-1: 0cabeef030b1486f24d7a81af136c6870b284ef4 SHA-256: d4be7367b7c0f67b4d441e51e392813d95136d8abb5e17acdeb43dee0ffc7459
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to various PDF resources. The document contains numerous external links, many hosted on disposable domains, suggesting an attempt to distribute or obscure malicious content. The presence of a link farm and the overall structure strongly indicate a phishing or malware distribution scheme, likely using the lure of 'free downloads'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/award?keyword=gym+exercises+pdf+free+download PDF link annotation
    • https://fixemebipufuw.weebly.com/uploads/1/3/4/1/134131586/kemaso.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/7608491.pdfIn PDF document text
    • http://lavkavkusa.store/architectural_photography_principles5mxn1.pdfIn PDF document text
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/47da2338.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/2386e382e9710d.pdfIn PDF document text
    • http://vovpomnim.ru/free_template_cv_creativehj4ov.pdfIn PDF document text
    • http://winoorama.site/fomulakavorepamokopem24o16.pdfIn PDF document text
    • https://tozuvosakum.weebly.com/uploads/1/3/4/4/134471329/8d6645166.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/72de2c07.pdfIn PDF document text
    • https://jutikuned.weebly.com/uploads/1/3/5/9/135966087/fevexikufi_kubujirom.pdfIn PDF document text
    • https://kimivatebuxokas.weebly.com/uploads/1/3/4/7/134702804/1823455.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/rapugug_nipasabi_zuxaxera.pdfIn PDF document text
    • http://arfesopt.com/body_for_life_dads_green_chili_recipet58u8.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/f7b3f3f0e992971.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/a476eac.pdfIn PDF document text
    • http://argo-tourism.com/74109993363piu48.pdfIn PDF document text
    • http://logvoz.ru/vowuboxabanivfb17.pdfIn PDF document text
    • https://nuxabofubuwaxef.weebly.com/uploads/1/3/2/7/132740905/8865681.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/f3ef536d-b1ae-4070-a5c5-43cdb79ef35a/73326785140.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372e02bc-8da5-423d-b9ee-2799fdd2da96/how_to_still_exercise_with_plantar_fasciitis.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_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 5596 bytes
SHA-256: 503e03c5b82366c552b6f42ba4c3eef2d915b8ebfc196d19973e762f9aea1fd1
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 11032 bytes
SHA-256: 085459b0cf0a501e7cba676f680b82298f315fddc8db81e10c9036ca2cb5ca47

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