Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ea167fa225e7a1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-17 11:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1e37efa570e1a9b1ea80790a2662970 SHA-1: 5429d7ebabd59f7fa1c6a6cf1a17a8b4e4a77b7f SHA-256: f5ea167fa225e7a18ba6c8b16651eae99e960d8763084f1dc1449d6a5a5503b0
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. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure itself appears to be a lure, with the document body being heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://huntic.ru/uplcv?utm_term=hatsune+miku+meaning
    • https://safetypadlocks.eu/eurostyl/photos/file/mamujodakawegob.pdf
    • https://agri-mal.pl/userfiles/file/lemutokilozatapa.pdf
    • http://www.tsahimmongol.com/uploads/images/files/xasofubevoruwemudinitel.pdf
    • https://at-studio.tw/app/webroot/userfiles/files/20210906_231409.pdf
    • http://beauty214.com/uploads/files/202109110808018678.pdf
    • http://transporteslaplata.com/imagenes_web/file/99406499859.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/dijowogobal.pdf
    • http://centrlita.ru/archive/image/file/bulaxa.pdf
    • https://equalitas.es/userfiles/file/napirulig.pdf
    • http://jongauger.com/userfiles/file/nobime.pdf
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/vevivifokuron.pdf
    • http://dinskayarealty.ru/media/file/dumuvepebidosetodewejobu.pdf
    • https://ymvii.com/admin/upload/files/64309171682.pdf
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/vuwesexopu.pdf
    • http://iamsong.vn/uploads/files/zopadepepud.pdf
    • https://santa.sg/images/users/00000000/files/50369059344.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049bed49a5---50898196426.pdf
    • http://www.travelwithtaangoo.com/img/file/13018245074.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/39317771949.pdf
    • http://hasanmasat.com/ckfinder/userfiles/files/xonikoroseki.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/44517282436.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143015896d7b---11658190696.pdf
    • http://tamlaproject.com/userData/board/file/29211286434.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://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_off0000d0c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C4 16792 bytes
font_01_sfnt_off0000e8db.bin
ddaf76d2d8a18676a7a5e388277be32b4f352fd0cdb09e94b1d6ca07bc4ecfe2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 10368 bytes
font_02_sfnt_off0001003c.bin
1bef4312453217f11feb5843ee4c6d0afa207c148b9aa1c03e25d599ccaccb1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1003C 18748 bytes

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