Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fd49f339fd315d…

MALICIOUS

PDF

65.6 KB Created: 2020-11-24 19:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7addf3aecf275438f9d0cc1a60854c4e SHA-1: dca2065fff44a199c8ad6c9f87343995f7d5f211 SHA-256: 31fd49f339fd315d813cf7d74198ce31e8140b2321c236ff83ac1e106153c3cf
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://trafficel.ru/strik?utm_term=4th+down+magazine PDF link annotation
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/358210d4ddf3.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/purufiz/gadogoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7fa42c-9df3-44bd-863b-009d2e20be92/wiwewadalizoros.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/21553284378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbd4ea1-46c2-48fb-9bea-94d3e62a8d34/midinafadofo.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/38132773748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298e943c-3656-4477-b317-14c452240bb2/pakomisixepolol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f32e98-513b-402a-b65a-2719530806d4/gemebusuwokanizofiboze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f775a8a7-b8d2-4096-bbba-02209dd2499a/xedoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86898f8-9630-4d6c-b0f2-98f1f1c08f7d/95690631501.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/greenworks_25022_amazon.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_off0000c699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC699 5068 bytes
SHA-256: b1ab0ac011fcf0f4d814abf33a6fc80e6dfc494e10e294cd40e5fe0b4019678e
font_01_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 10108 bytes
SHA-256: 33282081a85b268264611d908a2953d6a1bdb323141c77f5ee61c71ae89d752b