Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a83ea4f5b980a47…

MALICIOUS

PDF

80.4 KB Created: 2021-03-15 09:25:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 20f39e168486ef32602cec43ec0edbd6 SHA-1: aff84ec1979980ea9ee8c4129a064a139056afd5 SHA-256: 2a83ea4f5b980a47ee9ae4cc02814ea8c75dd999d65894126e275806b1d85c43
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to a site related to 'boss gt 100 specifications'. This suggests a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=boss+gt+100+specifications PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478933/normal_600d1729513e3.pdfIn PDF document text
    • https://legaxebojidonet.weebly.com/uploads/1/3/0/7/130775342/gowowamezogekowasusi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374373/normal_5fc692f032d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_603873df8059a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504788/normal_600c8ce9701cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_6041c6957ea6a.pdfIn PDF document text
    • http://devgm.design/el_principito_pelicula_completa_en_espaol_latino_2015_megaszmuz.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/kabetoza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5fc864a0cbb9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382958/normal_5ff4abec269bb.pdfIn PDF document text
    • https://bubipirem.weebly.com/uploads/1/3/6/0/136086135/tubobupasepo-nejinenaj.pdfIn PDF document text
    • http://zalavsky.ru/953197016794cwxu.pdfIn PDF document text
    • http://voicebftyi.com/green_bubble_blue_bubble_iphoned0bo7.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/a484f1768.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/5063c589-46ed-401f-8d1a-0bbd4859d886/how_to_pair_motorola_bluetooth_h700.pdfIn PDF document text
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_77fbc4aea70041cb94bcd03da5efde5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b19ba3-c0b8-432a-a552-f55251becfd7/warerivarukaleg.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_2d1d62af436b4ba7980ff63f20426ba9.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_d5731efd78cc40a099f984ab577db279.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1e80eb-db2a-45dd-b780-010d24f835fa/what_do_you_need_for_a_chick_fil_a_franchise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332d5c1d-7485-48fb-a7ad-211e5988a50d/xokujoziwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4cc845a-6f80-4c9c-be79-8c3e52ea2974/lovekarito.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_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 5300 bytes
SHA-256: 5dee820b20a80450fc6fb910f8dac41da1622bfce5abc55b2e0c2ae0ad32d042
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 12520 bytes
SHA-256: a1e0059d0aeac2e98490bd72266727549d60326cc66aff09a94283138afef75f