Malicious PDF — malware analysis report

Static analysis result for SHA-256 5743b0ef4655d013…

MALICIOUS

PDF

67.8 KB Created: 2020-11-09 18:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 746cc89b418efced6865bf4a285164e3 SHA-1: 9147b3088d0c075a0392f9bc268c39d713717c67 SHA-256: 5743b0ef4655d01346249e1ec1c19e7f3ebe3b0b0cdb9e975d4c15cdbfda26e0
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffe.ru/123?keyword=gas+mileage+for+2020+nissan+pathfinder PDF link annotation
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/pokudekisifanetas.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/guguxepejuwo_subuzome_pebamofej_mokifazi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f89c7dd96ea3.pdfIn PDF document text
    • https://pemesekisubabas.weebly.com/uploads/1/3/4/6/134659876/4392256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f9ad535730cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_5f9ade183ced7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5fa80a2852327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_5fa286bcda512.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/latufenaw/skechers_commercial_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/xukemezulewu.pdfIn PDF document text
    • https://s3.amazonaws.com/radaruropivoje/najasasatusinunukuvebimoj.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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 5760 bytes
SHA-256: 56a5dd27704f3acbe27c265452a326c6e6d5767482e456cc0ac8840ae2cdb295
font_01_sfnt_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 10508 bytes
SHA-256: b17cea60b8072ee497ec75efe4b7b51ebe971dfd7aae039dce4bacb1be7cb0a2