Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6550582aed15ec…

MALICIOUS

PDF

82.8 KB Created: 2021-09-16 19:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4212cd9a29b2305f23ed2aa8b8573f1f SHA-1: 55b6adcc9ca388a01191716f48c3542c5634f06c SHA-256: ef6550582aed15ec13ecc3132b896ae68b232966e196a348545f6e53cca3ff7e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating a potential for malicious execution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest the document is designed to redirect users to a variety of potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142197174e2b---32156381688.pdf
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97188702502.pdf
    • http://emrc.ie/upload/imagecontent/file/73780679534.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1d9d81dc0---16916998887.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/lunufa.pdf
    • http://schubert-hh.de/image/file/30845124566.pdf
    • http://archinfo.ru/uploads/file/sipiwafaregewesizetabadog.pdf
    • https://heart-calligraphy.com/uploads/files/202109061824288373.pdf
    • http://ganteltechnology.com/system/userfiles/file/pexuxajiwi.pdf
    • http://888chji.com/userfiles/files/6821713082.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/serowuvodot.pdf
    • http://tubietelbar.hu/uploadfile/55985350727.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2p86ekq80g6tke0p4koemp0hev/xaxevifazakogatake.pdf
    • https://egyptsuntours.com/userfiles/files/57790897904.pdf
    • https://alubiasdetolosa.com/files/galeria/files/30006396253.pdf
    • https://harkakotony.hu/UserFiles/file/10653277024.pdf
    • http://altiro.nl/home/tjerk/file/63467103449.pdf
    • http://wellfoto.cz/pictures/files/8642249435.pdf
    • https://wisestudentz.com/userfiles/file/61388518344.pdf
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/murawitejenuzikibax.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/4181733826.pdf
    • https://groupburuemas2.com/contents/files/xudeg.pdf
    • http://studioschicchi.eu/userfiles/files/koravuxuf.pdf
    • https://kanat.com/upload/ckfinder/files/7479865291.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=electron+framework+android
    • 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_off0000e237.bin
ec6c87588a11c355c236e515b20f215cb82978eaed3a9d3f68c7dfff1847f0fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 10628 bytes
font_01_sfnt_off0000fa8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 16792 bytes
font_02_sfnt_off000112a0.bin
0c71dfca0737aa53793c36405955a370f7a31882bce78926d56ea0cfe9edb4e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 16688 bytes

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