Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ff3f38b5a35afb…

MALICIOUS

PDF

68.6 KB Created: 2020-12-19 16:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f666489afde4e8abcbe934351e9c57cd SHA-1: 97d854ba71c0092c33fb1067819fc5b27b63005c SHA-256: 91ff3f38b5a35afb5cc437afc465cea26e9aa326c6cac16c697274d5d93c14c9
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-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://trafffi.ru/strik?utm_term=poo+poo+point+trail+difficulty PDF link annotation
    • https://josuzowonuni.weebly.com/uploads/1/3/4/6/134685096/siwidaxaw_fawilebufuzum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_5fb278f75ad8b.pdfIn PDF document text
    • https://suranetu.weebly.com/uploads/1/3/4/4/134458043/fegadukezigula-vopuguvujamef-paresusi-mozovute.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/72b52e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5fc949910cf4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_5fb5f8786b520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_5fd7c59ca29d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_5fa3426057319.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9b4eb7-1563-481e-99f7-f9c84a6dbc31/nozosatotilo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc009dd8787e87989674e7e/t/5fc7099e2ac13f1ee9b16445/1606879649696/80643054069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc9a1fe-9c8a-4f70-875b-679c0bb008b2/17752848476.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_off0000cf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 5076 bytes
SHA-256: e1618bf8ad1864708138fe4469def3461b30d749b10e03817893d90597180f5c
font_01_sfnt_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 10912 bytes
SHA-256: 268c95f8fdc317b78403882535f2ba767ac3c1ae0109aa052ca4229e2a5d9c02