Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecf842f4781482e…

MALICIOUS

PDF

81.2 KB Created: 2021-03-25 18:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c87a16b95fa4ee450a95c6d92fd3532b SHA-1: acf0ee75c7650d50f9df9407b734ad02741233b4 SHA-256: 4ecf842f4781482e07c618dbdc43c4f2af7327926242a61b55c1ab1f4f6aeadf
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The PDF's structure and embedded links suggest it is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://lozipotod.ru/strik?utm_term=ernest+hemingway+fathers+and+sons+pdf PDF link annotation
    • http://xadexawufomovi.sportsontheweb.net/2774497410.pdfIn PDF document text
    • http://kernig.pro/87115266378atsnp.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/cgd9ihI/693849003.pdfIn PDF document text
    • http://stavki-na-sport.site/20408917591c4zkn.pdfIn PDF document text
    • http://tamakar.xyz/90232331857tyiad.pdfIn PDF document text
    • http://free-at.pro/1._bowers_wilkins_formation_wedge5xlol.pdfIn PDF document text
    • https://cdn.sqhk.co/dugudumopup/jbhc3gj/centene_chief_information_security_officer.pdfIn PDF document text
    • http://phrensy.co/buxajanuripexatnkcfg.pdfIn PDF document text
    • http://zovemijeban.iblogger.org/the_ancestor_s_tale_free_download.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/standard_phonetic_alphabet.pdfIn PDF document text
    • http://soldatskaya6.ru/the_best_free_daw_for_androidwjpn9.pdfIn PDF document text
    • http://moitender.org/23375900869xneri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nudinase.rf.gd/alpine_cde_133bt.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_6515c6c35cad4927ae8f44d935c76c13.pdf?index=trueIn PDF document text
    • http://rodidop.epizy.com/chf_pathophysiology.pdfIn PDF document text
    • http://fegugeg.rf.gd/joint_sponsor_form_i-_864.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_1aaa85e04956466ca47fec172e11deee.pdf?index=trueIn PDF document text
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_ba7b2d417f374cbf99f543a48c1d415a.pdf?index=trueIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_96c487c0efeb4b648bdbe281e118d9ed.pdf?index=trueIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_8cf7151421ce4bc29d2dd46eb5b89540.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 5360 bytes
SHA-256: f12c587b3063a16bc2cb78c08173941a4b508850170de4b4fa6b59844cfd419b
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 10604 bytes
SHA-256: e607886cff879f90e3b97c01e549614d85251f3469270da85b271eb44fc53916
font_02_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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