Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af4d140463cd374…

MALICIOUS

PDF

93.2 KB Created: 2021-02-28 11:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5390c645ee84cc78f227251e0c71e0c1 SHA-1: d566a7bd94865303e056275ebf66649e6441278b SHA-256: 7af4d140463cd374c4e55831444060e7a1fbc8b4007e1c1d92d2a7ed55593201
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and likely serving as a link farm for SEO manipulation or to host malicious content. One critical heuristic indicates a direct link to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+connect+bluetooth+to+kenwood+kdc-bt362u In PDF document text
    • https://static.s123-cdn-static.com/uploads/4413583/normal_5fe2a9068eb82.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/2005_chevy_impala_repair_manual_free_download.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/9864614.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/furisukejiraz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_600fd63d88c87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5fd8da7448535.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/2003_dt466_valve_adjustment.pdfIn PDF document text
    • https://xazefobilizap.weebly.com/uploads/1/3/1/3/131384081/1483756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_600c8ae544b78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473384/normal_5ffce4611c6a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423452/normal_5fff96c8a7436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_602751d560f08.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/4526416872.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499660/normal_5ff23cfd2c096.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/juvuraguvutoxif/dowal.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/list_of_pema_chodron_books.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_off000130fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FC 5280 bytes
SHA-256: c5e51398d1b0c3e7632f8b636f4f79f4c11172924fd89c1b92a1d145074b7ae5
font_01_sfnt_off00014304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14304 10708 bytes
SHA-256: cfd69a993f5dc636dca1070225602eb26d5ebd1a26985495c718b743d45fa9d0

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