Malicious PDF — malware analysis report

Static analysis result for SHA-256 665666d12cc693d0…

MALICIOUS

PDF

66.0 KB Created: 2020-11-25 04:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1082ca4eb561d4ee2d42db4e03cbd9f SHA-1: e83db2199b1a3b8a1c5b2a127df3d3ac1e7f4f71 SHA-256: 665666d12cc693d0e4ab5794ee223d9fc1007313fc56630b97a2497b6a45e556
214 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it links to malicious redirector infrastructure and is part of a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=android+tv+box+user+manual
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/kigimoja.pdf
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/rabiputujupa-makat.pdf
    • https://cdn-cms.f-static.net/uploads/4447087/normal_5fa1ea398fe6c.pdf
    • https://japiloxekafu.weebly.com/uploads/1/3/4/4/134480389/1628776.pdf
    • https://ranuxibat.weebly.com/uploads/1/3/4/5/134595997/4882848.pdf
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/9229802.pdf
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5f9a34ddb9e5a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/poresi/doodle_god_modron.pdf
    • https://s3.amazonaws.com/jeponowon/spinning_wheel_cars.pdf
    • https://s3.amazonaws.com/wavunot/amelia_bedelia_first_book.pdf
    • https://s3.amazonaws.com/ditiruz/bilutv_phim_l.pdf
    • 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_off0000c5ac.bin
781e1d04e30423f129dc4979680b1bcac39d39b4b0be410bc5353933be6a4fc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 5228 bytes
font_01_sfnt_off0000d760.bin
327ecfd67da51879ec04ea38608004f0760170957077debd4c06fe340474e71e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 10728 bytes