Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6e95f867065b90…

MALICIOUS

PDF

63.9 KB Created: 2020-12-18 05:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa7cb72b14f674ebb395c75c9dde31a0 SHA-1: 12a8406c071059816770076e11296aace05b83f2 SHA-256: fd6e95f867065b90956925e5f8edc7cf132f718c480945ca616d3a4edaad863d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one suspicious URL pointing to 'trafffe.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/strik?utm_term=guide+gear+waterfowl+jacket
    • https://cdn-cms.f-static.net/uploads/4406481/normal_5f93b811d8307.pdf
    • https://nazuvunu.weebly.com/uploads/1/3/4/4/134438845/xakikal.pdf
    • https://cdn-cms.f-static.net/uploads/4482858/normal_5fa6d421e1ecc.pdf
    • https://daxexamuve.weebly.com/uploads/1/3/4/4/134446800/kutusi.pdf
    • https://mibigadoguful.weebly.com/uploads/1/3/4/7/134759919/a0abf25bddcf2.pdf
    • https://nejalebemenogun.weebly.com/uploads/1/3/1/0/131070187/7317436.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ef4e2fc0-8e08-4f97-bbdd-28a86adc3609/73085334580.pdf
    • https://s3.amazonaws.com/jevedijadiki/cladding_sheet_thickness.pdf
    • https://s3.amazonaws.com/daraniwekamidir/wexodarugidafevufufito.pdf
    • https://static1.squarespace.com/static/5fc0879da3bf4b14aba759f2/t/5fc0daa77acac6192ae10e9a/1606474408309/66864262960.pdf
    • https://static1.squarespace.com/static/5fc149a6a3bf4b14ababd147/t/5fc85e86ee804a17a1cf6c09/1606966919309/mekigujanoxago.pdf
    • https://s3.amazonaws.com/jupevuxirapi/contact_lens_prescription_vs_glasses_prescription_answers.pdf
    • https://s3.amazonaws.com/jenagubadopi/88786965725.pdf
    • https://s3.amazonaws.com/vebogotexaf/68252917871.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bead.bin
0c07362404a2ca47eda61a0a93be8757b8d004f1fe407e6954f14c3e4b04a5a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAD 5276 bytes
font_01_sfnt_off0000d0cf.bin
5db2255cb5cf35861711af038534779e0afb4aed00cf98252374e83c8e3ee580
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CF 9888 bytes