Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f082e2c809b4c09…

MALICIOUS

PDF

72.2 KB Created: 2021-04-08 01:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c30cfa98ec9c8de34a82b864bbf90ba6 SHA-1: 5701088df3b938a88780205636ac023c9d3caa07 SHA-256: 3f082e2c809b4c098fecffb80b9ba7260a9bfd4aa087e7da87897fdd247e74f0
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 0.9956

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://crophysi.ru/wix?keyword=mary+c+williams+obituary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416665/normal_6068a3ecc69e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_606b4ea4e4bc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_60028a5ad4402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369626/normal_5ffc556a9f11a.pdfIn PDF document text
    • http://airbin.top/yo_amo_a_juan_querendn_captulos_completos_online460th.pdfIn PDF document text
    • http://oneitshop.info/how_to_make_label_round_in_swiftjmzkb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471475/normal_5ff4b58586136.pdfIn PDF document text
    • http://mejumeroxara.mywebcommunity.org/jubonexomalawuluj.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/71171283516.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/vikojalilajulil.pdfIn PDF document text
    • http://suwufexez.sportsontheweb.net/864064951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367622/normal_604d784ad0e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459936/normal_605d6d5c27405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476126/normal_5fd6ce85bd0cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_605f62e90edd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407327/normal_601fc8cc78d66.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/64281950014.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://motuvogipe.onlinewebshop.net/what_is_atmospheric_window.pdfIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_71a25aa36b774afca97ba407dc4540ad.pdf?index=trueIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_dd24f77fb51a4527bcd3c0f83fc1d3cb.pdf?index=trueIn PDF document text
    • http://wozitoso.atwebpages.com/vuvuveju.pdfIn PDF document text
    • http://titugol.atwebpages.com/vusujekojiwujutizuw.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_3d29e133c96d4a04993237cae3517179.pdf?index=trueIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_95319354dcce481486920e036fbb8f2f.pdf?index=trueIn PDF document text
    • http://kamigawox.atwebpages.com/intervening_variables_in_research.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/mpumalanga_bursary_application_form_2020.pdfIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_3bcf07aa37924f2a87e896f4d9f1beb5.pdf?index=trueIn 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 5284 bytes
SHA-256: 9a03888c524e0820327096795558e82e970eb7b1d97cf6a32d5c877a56218d17
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10372 bytes
SHA-256: db86216d54b0c193d45730261578b4769339f833b79b32eedb1d6c81af9b38e3