Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07e8a6c1065fab3…

MALICIOUS

PDF

80.9 KB Created: 2021-03-13 19:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6fd8cf6557818467557d4e91d40a842 SHA-1: b34ed37d54c966f21ba575f4ebd9c6f49f91c9b6 SHA-256: f07e8a6c1065fab36dd482441f03f8a6d836886f2169cedf5998974f36f305c9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as job search results, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URL `https://zajinet.ru/strik?utm_term=part+time+software+developer+jobs+near+me` is likely the primary lure, directing users to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=part+time+software+developer+jobs+near+me
    • http://java67.comCoding
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_f64a3d318a5547caa93f44c5acab8b1b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1eff81c0-a44a-48ec-98db-d5cb1412e53c/15291661389.pdf
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_9aaa01b4a2dd49019b58ccb6ea00e252.pdf?index=true
    • http://keviful.epizy.com/dopesazil.pdf
    • https://uploads.strikinglycdn.com/files/9419236a-ec03-45c7-9ec4-e1121e07cd4e/romusazisulu.pdf
    • https://s3.amazonaws.com/xutomoxu/how_to_change_last_name_on_drivers_license_indiana.pdf
    • http://pasivete.epizy.com/car_racing_game_free_online.pdf
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_6eca79d5bb7e437fb80c20d24c835caf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/df03b785-f8fb-4903-9f8e-28c2a7f3468b/67869654781.pdf
    • https://s3.amazonaws.com/bibejovixapis/hips_plastic_sheet_australia.pdf
    • https://s3.amazonaws.com/debamijizozexo/95911480464.pdf
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_074bd4669c4d4048bd45d89dd7a253f5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b181619b-3c4e-4209-908c-c864ad63d5cf/32778193335.pdf
    • https://s3.amazonaws.com/tidigudetefumof/dayz_battle_royale_for_pc.pdf
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_a0e988c6ae8d4f0aaa7ea38430a606a8.pdf?index=true
    • https://s3.amazonaws.com/jupevuxirapi/legal_action_letter_template_uk.pdf
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_452a8973f5ca479688e576eccfc97d75.pdf?index=true
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_3ee9fa90e54b40cb8c4ad59e9f056848.pdf?index=true
    • https://s3.amazonaws.com/davolazupivowi/ashabul_furud.pdf
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_9f9afcb42aa040c58b139a699242600d.pdf?index=true
    • http://kewivifonawati.epizy.com/72742298193.pdf
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_ad7df9b3f02b4cedb3798083534cf366.pdf?index=true
    • http://mukesul.epizy.com/chaconne_guitar.pdf
    • https://s3.amazonaws.com/divelatoxa/the_birdcage_full_movie_free.pdf
    • http://javarevisited.blogspot.com
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde1.bin
70e3137b6ceef75df041c71ef5fc3a1c6ecfd0c2d3fdda572152572eb495bd2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE1 5556 bytes
font_01_sfnt_off000110bf.bin
0e6719ae9ff547533d350cae0539294f4b0c07b66585556b57dd60714e394971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 10940 bytes

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