Malicious PDF — malware analysis report

Static analysis result for SHA-256 be35fbace48d2b29…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 12:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de62ee2d7aafdc3941ffb5ba90c7a527 SHA-1: 9c1630c8144e57e4abcd99defb9da7272310d995 SHA-256: be35fbace48d2b29050c4ebca7e02fea110b7fdc3818bcff2da38ffde99c4577
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to distinct, disposable domains, characteristic of a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious content, possibly exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ppkh.net/userfiles/file/sedavewenomedorobikijob.pdf
    • http://dgone.kr/userfiles/file/20210907054042.pdf
    • http://kftchem.com/upload/files/73164851999.pdf
    • http://denis-lefebvre-services.com/fichiers/file/tiwigaditukesizefadinoj.pdf
    • https://shopexpert.com/app/webroot/files/userfiles/files/lakizumogozotataful.pdf
    • https://ntc-container.com/upload/files/60990757314.pdf
    • https://hoangphatdanang.com/uploads/image/files/32706625066.pdf
    • https://newtech-utm.pl/userfiles/file/37329499683.pdf
    • http://devison-matras.com/upload/file/dafulibin.pdf
    • http://luligang.com/ckfinder/userfiles/files/xizokufejawotipanewosulo.pdf
    • http://happyorderfood.com/uploads/files/vujuboxanigotegaru.pdf
    • http://milwaukee.center/userfiles/file/59775832145.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/8039078951.pdf
    • http://synphabase.ch/upload/file/53346103741.pdf
    • https://italvaping.com/file/40607130498.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/1341177817.pdf
    • https://perfecthospital.org/ckfinder/userfiles/files/sigidiwu.pdf
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210903212429.pdf
    • https://renault-service.com/userfiles/3457167563.pdf
    • http://yas-center.ru/userfiles/file/75554287321.pdf
    • http://balbu.eu/uploads/news/file/pigomepos.pdf
    • https://matteagianotti.ch/userfiles/files/46477250458.pdf
    • http://tvcsoltau.de/userfiles/file/69647098563.pdf
    • http://jiuxingchaoshi.com/uploads/file/101357336554.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613212ec694d1---kobezen.pdf
    • http://rilta.net/userfiles/files/28197534704.pdf
    • https://pediatricpotentialsnj.com/PP/PPpng/files/34300326947.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nearby+share+airdrop
    • 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_off0000ec36.bin
56fd2297a69d1e5096e8dca7b56548fb2c176317efdfd499352dca6c7ce4b829		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 18044 bytes
font_01_sfnt_off00011a95.bin
d51d86cd4ef573d4d937028d50d2ce531370abcfc87d94a2b057d8e468ab5a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 10472 bytes
font_02_sfnt_off00013247.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13247 16792 bytes

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