Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e06ff8507f3f65…

MALICIOUS

PDF

61.8 KB Created: 2020-11-13 13:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ee618f28351c71d08cd55029b58f455 SHA-1: 43b77261dd7fc8e1f9418f97cdeb087e53362b46 SHA-256: c3e06ff8507f3f65809ec9e0d5a1555b8f33acdf94c07de500c2d810cb144d07
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of embedded links, including one pointing to a known malicious redirector at `traffmen.ru`. The heuristic firings indicate a malicious redirector link and a link farm, suggesting the primary purpose is to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=amsoil+gear+oil
    • https://liforofejot.weebly.com/uploads/1/3/4/3/134350560/gevamubuvujotuman.pdf
    • https://wekowemawifov.weebly.com/uploads/1/3/4/2/134266616/kokujevepo.pdf
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/bcaa1.pdf
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/115503d.pdf
    • https://cdn-cms.f-static.net/uploads/4402244/normal_5f96809fd160a.pdf
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5f9fabe808636.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f8f87f185b52.pdf
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f8a5d1bcddbb.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f87ddbe02d91.pdf
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f9188f15c6cb.pdf
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/5683404.pdf
    • https://cdn-cms.f-static.net/uploads/4474176/normal_5fab0b3c2b4c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6c8.bin
74983a5f1766e5f2be1352f8a5429d2ea21ecbf7527d011a1aa3f4406814931a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C8 4996 bytes
font_01_sfnt_off0000c7ab.bin
2ea115119d279a3366eccc15d87837f287083c6a9888e89d1c80e1be135a43fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 10476 bytes