Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ae126efb3d2b5e…

MALICIOUS

PDF

85.9 KB Created: 2021-03-16 03:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0ff150fd0054e2b6c8b97bc73bfad1e6 SHA-1: 0297b4de86e186610077ceb1609a7037fdfdebb2 SHA-256: 82ae126efb3d2b5e9c9d2bfe7a587afd70aba14454fec20a67707d0585a8e048
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to technical instructions, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=how+to+install+a+hot+water+heater+expansion+tank PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421474/normal_6034ce0f1d8b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454290/normal_5fdec7d7f134d.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/ZicqnWq/pafetolup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_600e3dd188df5.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/gdFczSg/75926933120.pdfIn PDF document text
    • http://nasporte1.fun/sexejulezilusapev457tc.pdfIn PDF document text
    • https://cdn.sqhk.co/dijadive/hhUgihg/40390076237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5fdba6880bc09.pdfIn PDF document text
    • http://sberbank.link/is_saga_bank_safepg3a2.pdfIn PDF document text
    • http://sweetygirl.club/91398307160abnj0.pdfIn PDF document text
    • https://cdn.sqhk.co/dofubetu/jfjcgie/woxad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_600dc26268477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_60180b768a49b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408333/normal_60039f902527a.pdfIn PDF document text
    • http://axecheat6.xyz/skyrim_vampire_armor_replacer_modrw4ef.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/6a84cc06-b9a8-4e1a-8cdd-1d61a2c6606c/the_great_gatsby_vocabulary_quizlet_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08234e2-563a-449f-8c10-05f4acde036c/is_super_metroid_a_remake.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000f9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 5092 bytes
SHA-256: 605d19ac1c3f32e0fc65226da5c9e236553e5accbb84c3f9a0cb466b7084fd14
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 12200 bytes
SHA-256: 4c9712bfa7a4117326d45ab5880b7eddc5b13dfe2836c00c9efe6e5873245971
font_03_sfnt_off000134f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F3 16060 bytes
SHA-256: 3210a33707ceda52ebe29b2623009cfb3b3d6b073d103cc6b07a85effab26d5c

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