Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c8ccb66b6d7fd9…

MALICIOUS

PDF

136.8 KB Created: 2021-04-07 08:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 017e3784a1bc2bdf061fa862b3ac1d34 SHA-1: 7a3c277b9e421bd327ca1a6a598a5cd0cbbad513 SHA-256: 82c8ccb66b6d7fd9ab8eb83172ed926f688733c86c178e05182c8c79bcd25008
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://zajinet.ru/wix?keyword=cual+es+la+ciudad+capital+de+francia', suggests a lure related to a search query. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=cual+es+la+ciudad+capital+de+francia
    • https://cdn.sqhk.co/wifurovud/4hhQmbR/chrome_os_76.pdf
    • https://cdn.sqhk.co/tutabalero/gc8ijjh/nusewakoxojemeb.pdf
    • https://cdn.sqhk.co/numavagoko/haZjcZP/hexaware_careers_for_freshers_2021.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5855807e-445b-419e-9e49-570cdda529fd/numokuxevogex.pdf
    • https://aa6eca1a-c690-4a36-985e-a873157a80b3.filesusr.com/ugd/081493_9bd025e4a8554c06b96335bb201d6943.pdf?index=true
    • https://s3.amazonaws.com/dovulavavo/butasog.pdf
    • https://uploads.strikinglycdn.com/files/3ba50db2-baa1-445a-9d28-cb9246defc82/sifapobesobazi.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_9423c8fc35664b1dacf23862af441dfb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5edea53-2a08-4f70-85c2-e6ab88b0d060/how_much_do_computer_support_technicians_make.pdf
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_04ca26e333344cf0858ef9e091058914.pdf?index=true
    • https://e41bb7a9-a35b-4578-ac27-1eab720d379a.filesusr.com/ugd/8912ce_3484640cb195410eb65ac04ef0d86780.pdf?index=true
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_876760e6d23a4cc59024c1b07d0ab149.pdf?index=true
    • https://s3.amazonaws.com/gedimuta/83418405651.pdf
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_208ed3677413454ba6ab6cc5255ff184.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f316232b-9617-4007-b4dc-0fe92bae11e3/kufotog.pdf
    • https://uploads.strikinglycdn.com/files/de19b8ed-45d0-4a43-83cf-094d9ac9b601/18214199556.pdf
    • https://uploads.strikinglycdn.com/files/759b0d66-8542-4b79-a124-000dbc9cb343/vekotukalavotunoxunib.pdf
    • https://uploads.strikinglycdn.com/files/390e47f2-2486-40be-b28d-e938daff9117/1978_honda_xr75_value.pdf
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_f8f0ce089a93411fbbadfbf060fc3884.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb60.bin
4e40298a411bd322b2228e989591a509563e457386f1cc567022f3d8e766b3a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB60 5052 bytes
font_01_sfnt_off0001cc9e.bin
ee398ab8e1b3dde37fc9c3d24b479278972582e84eb75947f6a11f5046d6a59c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC9E 16356 bytes
font_02_sfnt_off0001feaf.bin
d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEAF 16060 bytes

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