Malicious PDF — malware analysis report

Static analysis result for SHA-256 58859a8bb5e8ecb9…

MALICIOUS

PDF

68.7 KB Created: 2020-11-18 12:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bd3f78d918abbb7af31bc4201c575c74 SHA-1: 9bf55f136e9fae0e921bd483b3414ddbb9fa3ebb SHA-256: 58859a8bb5e8ecb9e0aa21bb67b34a6f44dea552be213044a552c75b0fe85df1
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://traffset.ru/strik?utm_term=secrets+of+western+tantra+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483359/normal_5fab0ea0a530e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5f9dd983d4581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fa0f1a0ef305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383702/normal_5fac4c0f9ab83.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/1525398.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/tedowafomaru/matibipumon.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/23227776157.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/best_radar_apps_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ebdb25-4f75-40ed-840d-aeaa97882f80/zooka_zs740_pitching_machine_with_tall_tripod.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/world_history_patterns_of_interaction_teacher_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/notify_chase_visa_of_international_travel.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/essential_fatty_acids.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_off0000cb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 5312 bytes
SHA-256: 92e9190c189b3e474c7bdd267d7cf4f546660559e0711d54521d4593e7d00511
font_01_sfnt_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 12360 bytes
SHA-256: cb0f7ac3e1adc0aaf2601616df9de7921aac9e88fe4a6c0c8ab0a2355ebf2be7