Malicious PDF — malware analysis report

Static analysis result for SHA-256 4350dc05cea9b9d6…

MALICIOUS

PDF

68.8 KB Created: 2020-11-22 07:01:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fd70e6d30501bd4e30eb3604625b63d8 SHA-1: 9e1029e502f822f077a2e2bc57e2b04efa04e48f SHA-256: 4350dc05cea9b9d69b60f50deb36b64f6526441b676e6422cdf1c0b4ad69d84f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=minish+cap+randomizer+tracker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491671/normal_5fb96cce33a36.pdfIn PDF document text
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/3442cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_5fae288d99dc4.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/8f4e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5fa46a4724518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374860/normal_5f9bac9c0b65e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f98a27f157c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_5f9b53bad80a0.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/jakujakula/subaru_ascent_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/farenokeradavolelilag.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/25219845597.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_off0000cf51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF51 5400 bytes
SHA-256: 250d2a5403d3163fa278dffcb49b0d007192a4899cff995c37deab8cd32582fd
font_01_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 10860 bytes
SHA-256: e421805e1d587e304d92877668a8cf7d6924ff8e3e88e7ef3ef393a4e9aab8b2