Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73f432eeaac74ba…

MALICIOUS

PDF

69.6 KB Created: 2020-11-24 03:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f47a324fd73378fdbef6f1699023f8f5 SHA-1: 1cd1ca279129df41d419b3aa8b7e7094d571dde0 SHA-256: d73f432eeaac74ba83f07ee12c8c6bf69fb00e044e1d3668b50d27d2bbfbfe9d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to drive traffic to malicious sites. The primary URL, 'https://traffset.ru/strik?utm_term=naruto+shippuden+mod+apk+unlimited+money', indicates a lure related to game cheats, likely to distribute malware or phish for credentials. ClamAV detection and ML classification strongly indicate malicious intent.

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://traffset.ru/strik?utm_term=naruto+shippuden+mod+apk+unlimited+money PDF link annotation
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/zexalifa.pdfIn PDF document text
    • https://suxifobafip.weebly.com/uploads/1/3/4/3/134370270/turafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_5f8c038595412.pdfIn PDF document text
    • https://namazowofurap.weebly.com/uploads/1/3/4/3/134372349/lowaxetusag_sogofa_gebovapojukelik_nimaladupipif.pdfIn PDF document text
    • https://xurizuful.weebly.com/uploads/1/3/4/8/134898541/6299cf3.pdfIn PDF document text
    • https://femaxina.weebly.com/uploads/1/3/4/8/134886911/5396715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_5fb41d50c2073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5f9dc1c3d26de.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/pezofut/memurasefanaganufuzukoj.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/sales_agreement_template_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06cf4ec2-8d15-41a3-af39-5cf98c58ba9e/nimovazunutop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e34100a-3962-4fe5-8455-e30fd594f4ab/emt_medical_scenarios.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/area_of_trapezoid_rhombus_and_kites_worksheet.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_off0000d249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD249 5336 bytes
SHA-256: c86c9321e3115a8d5b7822ad0778daa1f529e6b17852f6d505fce5e1ccbae05a
font_01_sfnt_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 10864 bytes
SHA-256: 467c37bf97a4f748be14380ad671c1428018e1ff814b5ff144ab9034aeab8a44

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