Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42da83190081bae…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 22:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1cfda1419493c7b787cf3d964c742e4 SHA-1: c16681918e9c7e3318f467a3eba595c1a0d2d326 SHA-256: a42da83190081bae00d83f59c196bfee5458d43c5732db8e7173c17b71fe536f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of external links and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=o+words+list
    • http://photopuzzle.net/userData/board/file/tugefoli.pdf
    • http://purepassion.pl/userfiles/file/dozexewikowugez.pdf
    • https://parfumzone.ro/files/file/42387827065.pdf
    • http://flapboxes.custompackageboxes.com/userfiles/files/zipotuxepog.pdf
    • http://constantcontinuity.com/membership/data/files/vebivagutotomimaz.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613685bd8f5ee---20097966042.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161360340bc618---62218187087.pdf
    • http://szjg.hu/images/file/86165399806.pdf
    • http://metalltechnik-kutschi.at/lunuvaka.pdf
    • http://thsport.dk/userfiles/file/24844195360.pdf
    • http://mediaworld.pro/ckfinder/userfiles/files/wiwizamugipugiposurapo.pdf
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/nabusunajotoxotese.pdf
    • http://rambud.pl/uploaded/file/daposuloko.pdf
    • http://etnorom.hu/pictures/kupusojiturobinesanig.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7d263eef26e086e9780a4e2c5ce76768/gonigu.pdf
    • http://yung-shun.com/userfiles/file/68786901600.pdf
    • http://klawiatury-foliowe.pl/_data/file/5856874414.pdf
    • http://najlepsietorty.sk/uploads/fck/file/89427932207.pdf
    • http://palletgoanloi.com/img-dn/files/22141179053.pdf
    • http://jjc-dev.com/userfiles/file/bisijikiv.pdf
    • http://kbfrutos.sk/images/_file/91581984856.pdf
    • http://bilcafe.it/userfiles/file/riripuzezuporeserofinux.pdf
    • http://flapboxes.com/userfiles/files/doxoporixuvewexirawejob.pdf
    • https://www.pharmawell.eu/ckfinder/userfiles/files/21936937164.pdf
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/57131151734.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_off0000dc88.bin
74a7d90a8762c4c269e05349d6a87bf7c19da8cce9a1b3daea9561e8b5604a5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 17820 bytes
font_01_sfnt_off00010a56.bin
ed979229a619540cb1e884fe76549b719d5fa3c886261aee2f50f62b21d1d650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 9952 bytes
font_02_sfnt_off00012079.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12079 16792 bytes

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