Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af2f5a915086538…

MALICIOUS

PDF

71.6 KB Created: 2021-03-04 04:32:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a67532ca96551a538e8ff3b4faa0b435 SHA-1: 217c75e6d31f4877a9fb37d3ed9b8291a59fea36 SHA-256: 3af2f5a915086538524ba216fafd7e210f1f0f56f9cea2d9b213b7af51f0fabe
186 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 many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious or spam content.

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://leonvi.ru/123?utm_term=epson+nx230+ink+target PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413126/normal_5fd17c4e6fcec.pdfIn PDF document text
    • http://idealslim-italiaoficial.site/najususoremudodosixigawavuqkec.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/arcsoft_showbiz_invalid_license_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407991/normal_5fc9360a721fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_60357a0962fa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_5ff099c3da512.pdfIn PDF document text
    • https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/24d7363a.pdfIn PDF document text
    • https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/rosotodal-jafowikuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368243/normal_5ff27456b8309.pdfIn PDF document text
    • http://securityverifiedservices.com/zunoxapumuxogiw5sab3.pdfIn PDF document text
    • http://girlsbeach.space/kavabowoludigufajosohkz6m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485157/normal_603d611ed04ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_602e64a70857e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385614/normal_6016ebe82cfc9.pdfIn PDF document text
    • http://iglivesupportteam.com/beowulf_translation_tolkienx1znm.pdfIn PDF document text
    • https://topudikuwem.weebly.com/uploads/1/3/4/0/134042537/fanekuf-nijarotenijo-sixugenafef-xoxixojexakad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418575/normal_5fdee369129a6.pdfIn PDF document text
    • http://carinsusa.com/epson_workforce_wf-2530wf_wf2530wf69l7n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 5484 bytes
SHA-256: c08c63e04eb2ef810f159e3c9565cf56d71d92cf4270bd0801aef0199bff839e
font_01_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 10568 bytes
SHA-256: acb4b693e5e660d66d16a7db186b5801b915f8714626d14fcf23246e4a41b287

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