Malicious PDF — malware analysis report

Static analysis result for SHA-256 743ed237921cd482…

MALICIOUS

PDF

77.8 KB Created: 2021-05-28 07:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 336506712a0f6ace975c556820adf108 SHA-1: c6662ab92618c3b289dd4d69fc09c72cf9a92ee3 SHA-256: 743ed237921cd48288cc24569ba7c83337de9660f263751951c0b985f88bce14
186 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 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=escort+xr3i+felgen PDF link annotation
    • https://zepemotofilizag.weebly.com/uploads/1/3/5/3/135399015/rokiz_kolakimupar.pdfIn PDF document text
    • https://bimebupeku.weebly.com/uploads/1/3/4/7/134715010/zetuni.pdfIn PDF document text
    • https://nadoxeruxumebis.weebly.com/uploads/1/3/1/3/131398019/wusatufiwum-nexupixu-retesivi-putajeretuvat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386605/normal_5ff150d271890.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/9435107.pdfIn PDF document text
    • https://bikojeril.weebly.com/uploads/1/3/3/9/133999271/4686276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_605d72e96dc86.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/fababam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5ff3b330ecf9a.pdfIn PDF document text
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/4849465.pdfIn PDF document text
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/konuj-kabukededenur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_6023f6a944ab7.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/eb295c58-7f13-4c11-9360-47228b7eacb8/bapiravunoxuker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf76c6f-e005-407d-939c-fe81e1861400/84973128271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7133dd40-01e5-4b25-be30-afde197fa49c/19248529797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cfc5f44-6f1e-4f6f-8f5e-7e741c5de537/brandsmart_black_friday_deals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c308065b-220a-42cd-aa01-6274dfadf742/what_is_the_absurd_victory_in_sisyphus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2637fe73-b4a8-488a-baff-e92e7d19be42/779674385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409f1a66-144f-4d18-a8b8-3c1c28d86c98/99865435658.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_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 5028 bytes
SHA-256: 316d8e601c875071add84e2e935e922a3b5c9acd5ce4d2d9d50f258e94922e65
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 11436 bytes
SHA-256: f1d20094d50b227045cd775a9113abe4d86bee83a682d6fc53d4328d5b072c50