Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6a7b693b9d6215…

MALICIOUS

PDF

82.5 KB Created: 2021-03-06 17:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af2d28c3e64bf069787df8ea9b9ce84 SHA-1: 9109cccf636dbf790bda2226247ab9d166abf383 SHA-256: 9b6a7b693b9d62153dcec231f7fa75cb0eb38f1d948afd615447a647d7b60b1a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs, such as 'https://zajinet.ru/wix?keyword=a+street+through+time+pdf' and 'http://mon-fortuneo.best/c4_envelope_printing_templatef0whd.pdf', are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/wix?keyword=a+street+through+time+pdf
    • http://mon-fortuneo.best/c4_envelope_printing_templatef0whd.pdf
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/besuwivelurelel-xevil-xivik-zimipigarisivi.pdf
    • http://wwnews.site/34612803658st54j.pdf
    • http://newberginvestmentproperty.com/oel_24_de_deutschland_heizoelpreisex7w8f.pdf
    • https://wofirifitobad.weebly.com/uploads/1/3/4/3/134310136/faseripuzutenuberobe.pdf
    • http://gufutaca1.xyz/48910378331amjsj.pdf
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/wogisujawe.pdf
    • http://nncucuucuc.space/608033600583lkbq.pdf
    • http://uber-global.com/wexotimikogubolujojorojo3fh.pdf
    • http://complerbnp.com/fexaxazekazkpn0h.pdf
    • https://xevubevisebu.weebly.com/uploads/1/3/4/7/134754503/237e17535.pdf
    • http://helpcopyright-service.com/free_division_worksheets_for_2nd_gradedkisk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_d59fcbc56f72452aafb3985a3baba07f.pdf?index=true
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_22b621027c694427b2620986e0d546dc.pdf?index=true
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_0b22cabb13b946019db2915b083a14bc.pdf?index=true
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_369560cddd254c379ca834aef3db3539.pdf?index=true
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_020aa43ac8d74497a445c005a677f010.pdf?index=true
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_2edd3baff1ec42e7adce594aecbd4978.pdf?index=true
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_735a64ac33854eacb7b8f7df5acc7e4d.pdf?index=true
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_b1ef1f8fcfaf4cb29a75d6640beac81f.pdf?index=true
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_b20265b8c6db424cb7f9157fa0341802.pdf?index=true
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_043c76e5e5aa47efb56dca55c3906713.pdf?index=true
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_b8c0eac6bbbe42e3aa220f2e4ff1ada8.pdf?index=true
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_d5082100ed994c759a488bc07d42bab0.pdf?index=true
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_5ddab1a24e1d4f2ca49cea20a104899f.pdf?index=true
    • 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_off0001067e.bin
1d7d790d318550aa320e0327a76e22fc9b22b87f42c018ed6bd05e1f452651f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067E 5204 bytes
font_01_sfnt_off0001180c.bin
fca72b016796d75ecd0cc28636180fef38c516d374e3e6c9cf13ab8cf23c7226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 10576 bytes

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