Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f82f3cc1f4a5940…

MALICIOUS

PDF

72.6 KB Created: 2020-11-16 14:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 99b57a36c58d2fd42fc043064ba01080 SHA-1: d6af3ed12968ecc99c75b06864758b3c5ee5eeb3 SHA-256: 6f82f3cc1f4a5940f7acf56db572422fda0999350c2d54e8c03ec86a77e7b7da
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 0.9995

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://trafftec.ru/strik?utm_term=rubrica+de+matematicas PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406473/normal_5f9535c27e2f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5faf808077c16.pdfIn PDF document text
    • https://dakesepev.weebly.com/uploads/1/3/4/3/134308776/50e15ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_5faac9bab935e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410433/normal_5fa85046894bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5fa863eb270ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ce5a2c05-5ac2-4c78-b592-550516a9fc21/sozujekimakigeratupofeti.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/bose_cinemate_15_owner_s_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/assessment_tools_for_affective_domain.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/61778237717.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 4868 bytes
SHA-256: 31e1de5aadfe5e4aa9ff7db9f071e71ac4673a76aeab674dd646a2d0686b4d88
font_01_sfnt_off0000e425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE425 10828 bytes
SHA-256: e9e19427a8843457db3107cd56c34b6099ba6e08318ecf0dd03343bd91d49f4b
font_02_sfnt_off00010789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10789 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176