Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f5c5cba82b88ae…

MALICIOUS

PDF

139.7 KB Created: 2021-03-24 18:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cee498b7137b811910b5282cb960b5e1 SHA-1: 7070c77dfb30fffd471a5be5f36d87acb1dc6748 SHA-256: f5f5c5cba82b88ae0d060fa89818afb6da024e776223bcf3af75185f399549bb
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One of the primary external links is to 'https://nipisod.ru/award?keyword=introduction+to+methods+of+applied+mathematics+pdf'. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the link farm suggest an attempt to manipulate search engine results or redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nipisod.ru/award?keyword=introduction+to+methods+of+applied+mathematics+pdf
    • http://gozatelaji.22web.org/newuzolawiwitotoremekola.pdf
    • http://tapozifokun.mywebcommunity.org/kumegasoni.pdf
    • https://jeboxuxu.weebly.com/uploads/1/3/2/7/132710743/9348799.pdf
    • https://cdn.sqhk.co/fipexuwebo/gciingh/strategic_planning_process_in_industrial_marketing_ppt.pdf
    • https://cdn.sqhk.co/zabeluzitema/p9Jjh44/charli_d_amelio_wallpaper_outfits_tik_tok.pdf
    • https://cdn.sqhk.co/meradipuwiz/2Xjgnje/tegebofefegopi.pdf
    • https://rizigavitud.weebly.com/uploads/1/3/4/5/134581125/6177f930c7d8da6.pdf
    • http://fumexijana.getenjoyment.net/introduction_to_anglo_american_literature.pdf
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/sizop.pdf
    • http://pazazilomereli.22web.org/numuni.pdf
    • https://cdn.sqhk.co/savunowudob/n8iania/10252273748.pdf
    • http://jomawogopepapaw.22web.org/are_car_seat_bases_interchangeable.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bce23df1-6e83-44ad-906f-a5a9bd170f45/historia_universal_contemporanea_definicion.pdf
    • https://uploads.strikinglycdn.com/files/e7bb2e13-972e-4f22-9cee-d2f10de4de27/21945208390.pdf
    • https://uploads.strikinglycdn.com/files/7e0521ea-407f-44db-a350-0e629c52cd44/bojangles_steak_biscuit_ingredients.pdf
    • https://uploads.strikinglycdn.com/files/d312f4ef-bf69-49e3-9050-b86b71b3c617/bekodebaraf.pdf
    • https://uploads.strikinglycdn.com/files/162d0cf5-1ae4-4d25-bccb-a55464f6c0b5/how_to_work_ice_machine_in_freezer.pdf
    • http://xadeboni.epizy.com/canadian_passport_renewal_dubai_form.pdf
    • https://uploads.strikinglycdn.com/files/9862dd47-19d7-449d-bedd-9336de47a1f0/rogafe.pdf
    • http://lisewado.rf.gd/murejiwo.pdf
    • https://uploads.strikinglycdn.com/files/a930af3a-b868-43f1-9874-a0fa5102f120/liftmaster_csl24v_diagnostic_codes.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ba46.bin
fda9adfcc6d965a6be6b92f9493c7b21e6c77ea56e75e4afec18dd4c79b5bd8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA46 5332 bytes
font_01_sfnt_off0001cc38.bin
6e7b0433bf4f9e13965103555da14a76f7b1b65185bf6ae6ea25ccfb79c0762f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC38 2256 bytes
font_02_sfnt_off0001d5c5.bin
d4d7cdc361946043bfbb6272ecb710db9f56d3322f047e8e7f449eb811bbd18e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5C5 14512 bytes
font_03_sfnt_off000206fa.bin
75290564b165efd863d7a50b99c22633b8c365f2f78a08bb51e8cdc5a8294ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x206FA 17096 bytes

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