Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13cc381697827a9…

MALICIOUS

PDF

72.9 KB Created: 2021-01-14 13:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3b76e608aa69a549055a714c02f3b174 SHA-1: cab4ef64429d3c1c733f5f709fca229f49fffe3d SHA-256: a13cc381697827a943ca40271effe6ef908defa9632b9b949b675b7b3ec32fb6
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a high-confidence ML classification. The document contains a large number of embedded links, suggesting a link farm or phishing attempt designed to lead users to malicious sites. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://gettraff.ru/123?utm_term=good+great+old+one+patrons In PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_5fbb096b39a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_5f895d8eac174.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/hwoifZp/t20_world_cup_2022_venue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380876/normal_5fdd1529644f6.pdfIn PDF document text
    • https://site-1171384.mozfiles.com/files/1171384/lisumajigoxilule.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/d3jhVib/bogagexu.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/daadec30c1923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_5fb50dcb317ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_5f9a840de307d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5fedc33ec740d.pdfIn PDF document text
    • https://dokebama.weebly.com/uploads/1/3/2/6/132681336/1868c63f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F5 5156 bytes
SHA-256: ed0c5fb1b823929a3c4b562d0ce874268a284bff4eb2e2d93de1fa74fd8a5894
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10920 bytes
SHA-256: 80d260e9a4e8f88a56310a1ec9c3d5509cdcc1997089764f5979f8d8620b0a8f

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