Malicious PDF — malware analysis report

Static analysis result for SHA-256 06731ad9277493a7…

MALICIOUS

PDF

85.1 KB Created: 2021-05-24 16:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 39e08d71b272d638dccc1a8a2333fddc SHA-1: 5f8c9ffc5c2d12110afb5c0127cc9993b0dbadab SHA-256: 06731ad9277493a7ee75b0f0195eb00a626e4dfd7de80279f9ed59defc6991d3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://ponafet.ru/strik?utm_term=kirchhoff%2527s+voltage+law+circuit+problems+and+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416802/normal_6021d859d644b.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/wixinibudafexusovepu.pdfIn PDF document text
    • https://jelezasi.weebly.com/uploads/1/3/5/3/135347821/nilotuvit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fe6f38e4f57a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485823/normal_5ffbecdb53c72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_6019c19d738ea.pdfIn PDF document text
    • https://lotopunukulel.weebly.com/uploads/1/3/4/4/134473418/pedig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5fc9e1f7939b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479222/normal_5fdcb4d48cd0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_606e217400162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_601ee43f83119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380695/normal_600932fd5f789.pdfIn PDF document text
    • https://lakaboro.weebly.com/uploads/1/3/4/5/134502670/tomodinuzuzalak-bepejixux-roresejamonodam-tewuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502178/normal_604d073f4c8b9.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/d184d78a-6bc3-45ba-8a9c-240bffa98bf2/the_challenge_war_of_the_worlds_2_stream_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/lidaxem.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/avermedia_capture_card_software.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/diversey_sds_sheets_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a28d912c-7469-4daf-9e9a-af84686db2a5/46946511365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c2163a-b3fd-481e-9b25-e27167c10719/zoviri.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/19722431146.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/zuxududug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71dc8596-7e15-400f-a63a-12e62f54a916/dovpo_mini_e-lvt_35w.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_off000109ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EC 5864 bytes
SHA-256: 7b68cd779e1a75cd5e7c9b26b4d16a06f2499726727fe8c051f8d8356d8afa5e
font_01_sfnt_off00011dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDE 11312 bytes
SHA-256: 5203b211f120c79035ab4b74cde478b1244a997eb17271200b5e57ea55c5b61c