Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc721bae2fe37458…

MALICIOUS

PDF

90.2 KB Created: 2021-09-14 02:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8353b6ef7a7cbb7a460572a57b9e10ba SHA-1: e458d1c51ac0a24337f81984c3d90b8912f33dfe SHA-256: cc721bae2fe374582bb712e5d77097c3bab1fc59bff377042a0efa48d42523e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, supporting the attack pattern. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://mongolia-volkslift.com/uploads/files/40722189012.pdf In PDF document text
    • http://maremania.net/img_pagine/file/mivosasatijegupepizaxu.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/lajoresuvasarofoxup.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/nujurovi.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/47535967215.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/kerugiruribe.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/suxebuzujulubinevij.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/46235832214.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/pubesujipuvok.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/18150444452.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/melobawetesewasasiv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fc6a585f---12331390954.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/gagobimulufufotonigudupi.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/95655095821.pdfIn PDF document text
    • http://masonhn.com/d/files/62833958255.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/forevotovupesurusidu.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/19724350082.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/60648102684.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8827b0ba---67002534596.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/xavekatazukosu.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/risuz.pdfIn PDF document text
    • http://wsm.hk/images/files/68240698892.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/zexawujuzozuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dig+out+gold+diggerPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 18104 bytes
SHA-256: 834181b4e35d9e40fa0a91190f2928d55b21ba16e675f210c161f787e57ac9d4
font_02_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14472 10092 bytes
SHA-256: cbfcea885d553f6a23d54b05544efd9e82aaaf77fcc6d7ae8578e47ada4f66e8