Malicious PDF — malware analysis report

Static analysis result for SHA-256 724d4a9dbb8b0a02…

MALICIOUS

PDF

66.7 KB Created: 2020-11-23 21:25:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3f8d5e33d9e34ffcac7eac0ed55fc428 SHA-1: 1c4e855fc420fd9a533699b97729065bdcf0ef20 SHA-256: 724d4a9dbb8b0a028869e4bdba9d22ededeec6fec4b234339a9fbf0d7806e02f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one pointing to 'trafficel.ru', suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to disguise malicious activity, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/123?utm_term=the+ideal+team+player+book+club+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f9f5b981f7ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5f89d070b29e8.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/valewipe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5faa176749f5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486346/normal_5faf2805e8745.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/najubu/converter_em_dwg_autocad_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc431837-2003-47e6-9d75-0d46cd6de09e/89491137943.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/67211084089.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/phenol_formaldehyde_resin_melting_point.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_off0000c253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC253 5692 bytes
SHA-256: b5b68775f5e4eca3c8164d50c2d5ea4df22042653574b55b417969c522e66447
font_01_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 12720 bytes
SHA-256: 37107e59dadff4ec046e84db7c63bdaadec48a87779c3ef0541f14b760a9d656