Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa08bcede3a8668…

MALICIOUS

PDF

71.9 KB Created: 2020-12-27 04:34:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8ac82f433141f4ba1995d47e9234cf76 SHA-1: 7fb5bb9280162b3a26994d14008517e3abdff94b SHA-256: 8fa08bcede3a8668cc2e67ba53daf7177dd47454d02df3d59fcabef01d4146aa
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain keywords related to troubleshooting, suggesting a lure to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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=bissell+powersteamer+powerbrush+troubleshooting In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408871/normal_5fc295a1eadaa.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/lasuzabok_vazajuzuse.pdfIn PDF document text
    • https://benaputilog.weebly.com/uploads/1/3/4/7/134707665/9377246.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408599/normal_5fae5452bc692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5fbdbd228f4fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5fe25327d2d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5fbe86e9184f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f9b846323698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fbb3e42dd8a3.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/dukexajuj/pukatazizuxuwima.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/chesterfield_technical_center_at_hull.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/votanuralalizotozigesunab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4f3d97-eb02-49d3-8e38-22c7d703cb6d/wodawiwolowesigivudavugam.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/71739753698.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_off0000dcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFF 5516 bytes
SHA-256: c4f7e537b2f5f516fb621d0c68cd70e0d13e9732e3284093efd877a8afbd3346
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 10252 bytes
SHA-256: 6902e5d332d7c6a708a79b6c34f4a22f4abcf8e9eff304768bbf9e1f2f05e152

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