Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9de66ccfce1e6d…

MALICIOUS

PDF

74.2 KB Created: 2021-02-13 04:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 47a1072cf1e1034efb88c228421c567b SHA-1: b7475e7037c7469951ca6dccde4a20f95fc64637 SHA-256: af9de66ccfce1e6d4c2b2780dfa66d392695845d287406010aef1bcb61a46dfd
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating it is likely a phishing or malware distribution document. The document contains a large number of embedded URLs pointing to external PDF files, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One URL, 'https://yafferge.ru/123?utm_term=solo+bandos+guide+rs3', is flagged as a malicious redirector. The presence of these links and the overall structure strongly suggest an attempt to lure users to malicious content or facilitate further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/123?utm_term=solo+bandos+guide+rs3 In PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/9093012.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/7id6Zha/installer_mod_skyrim_vr.pdfIn PDF document text
    • https://kafomepavazepa.weebly.com/uploads/1/3/1/4/131409794/dd5b950808648.pdfIn PDF document text
    • http://about-igsupport.com/tattoo_machine_builder_the_bulldog_ftr867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451766/normal_601412ccedbac.pdfIn PDF document text
    • https://mezepobavufu.weebly.com/uploads/1/3/4/7/134717124/1446647.pdfIn PDF document text
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/bewabirobaboj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371003/normal_5fee2171b23b8.pdfIn PDF document text
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/1be0ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416132/normal_600bda7f36f47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367299/normal_5ff66b1560003.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/vapelurowar/52052266552.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/arcade_fire_her_sheet_music.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_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 5400 bytes
SHA-256: 1ed70744a5e6a48bcdc9d782df92057d2c3d6bd386815fb50990739acefbe409
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10320 bytes
SHA-256: 09b65b14442cd9ba5e8c6bc0ad02cd918ffb3a18c0bce691bd0d2ebd0d2c9e2a

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