Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca91bd0fd73d792e…

MALICIOUS

PDF

76.0 KB Created: 2020-11-26 01:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d5fbb64d970fbed1fbaa7a5138c4a5c6 SHA-1: d889495751f4428d14d23d85f9415e423092d0e5 SHA-256: ca91bd0fd73d792e811bef3886a3f9f4cf6b91a2b7c94d19a706eb3990d8bb40
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 0.9998

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://trafficel.ru/strik?utm_term=hypertrophy+specific+training+pdf PDF link annotation
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/dbc91.pdfIn PDF document text
    • https://baxajufukawe.weebly.com/uploads/1/3/4/3/134338502/milupelizarurud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_5fad27d305f12.pdfIn PDF document text
    • https://kolapudavuvoxe.weebly.com/uploads/1/3/4/3/134315715/sovedijodelewe.pdfIn PDF document text
    • https://naxejewosusubet.weebly.com/uploads/1/3/4/7/134749601/nirezi-wijodesulumunul-wuwamakok.pdfIn PDF document text
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/musutixitavik_ganiwe_kanuraza.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/voxazedisula/rearrange_file_pages_online.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/fnaf_ucn_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/doduzov.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/algebra_1_sol_review_packet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/lufejosapoviredaros.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/61683802722.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/varus_guide_lethality.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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 5448 bytes
SHA-256: 04c60bb65ea1ff2e4adf5ae40cd28b19a9731ec174c083c8d361adb0aa1a96be
font_01_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 11224 bytes
SHA-256: 43c9bd94644a9e4b54cc52d915ef3ea6fca6b1e41902968da92583c093e833ba