Malicious PDF — malware analysis report

Static analysis result for SHA-256 debc43fdf1a86a47…

MALICIOUS

PDF

58.1 KB Created: 2020-12-15 05:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 150d235649d497fe57038c15d7d2ae98 SHA-1: d104474c86b261c473d589db267f3c1445acd064 SHA-256: debc43fdf1a86a4779652a76bba2ef4b4a3618dbfb97769f73b960b3323d51b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external links, with a significant number pointing to potentially malicious domains like 'traffnew.ru' and 'weebly.com', suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a version number, indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?utm_term=simon+xt+user+manual+v2
    • https://ligibodi.weebly.com/uploads/1/3/4/4/134469997/galopudef-lonezadew-kunikikefalixil.pdf
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/gebapiwejijekomo.pdf
    • https://rutedidatares.weebly.com/uploads/1/3/4/4/134490949/6bfd7b.pdf
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/nubasolamu-tokupukiririj-tugog-temeletuxux.pdf
    • https://cdn-cms.f-static.net/uploads/4450511/normal_5faaf2dd458c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3066ce59-9e66-4081-b82d-bf1fa056e281/dejedodigagugoxanu.pdf
    • https://uploads.strikinglycdn.com/files/3aab23b7-cae3-4b86-8da6-99df7e63a5a1/zeolite_autism_treatment.pdf
    • https://uploads.strikinglycdn.com/files/48116ade-fddd-46ed-a7eb-0fd16b4b0135/fifty_shades_of_grey_book_2_read_online.pdf
    • https://uploads.strikinglycdn.com/files/a340eced-aba8-4098-9823-c3881b198838/osmo_masterpiece_app.pdf
    • https://static1.squarespace.com/static/5fce39cd98f154499f361b13/t/5fd13f07e09a1e6e1d979a39/1607548680418/12130236160.pdf
    • https://uploads.strikinglycdn.com/files/856f2f57-49b2-4d2e-abd4-df25f659e4b7/damoditozivis.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_off0000a790.bin
98cd1eece009bb0d16d305771b2b54d1c2bf9bf20eadb1a62698f124edc7fb25
pdf-font-stream PDF embedded font (sfnt) at offset 0xA790 5196 bytes
font_01_sfnt_off0000b924.bin
72324587b222779a513b540f3bf891936ebccac5d0c7639716f053698b24f406
pdf-font-stream PDF embedded font (sfnt) at offset 0xB924 10196 bytes