Malicious PDF — malware analysis report

Static analysis result for SHA-256 73964c9f482931da…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 04:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6291e3a0d7a65a1c193bc1f0a5062318 SHA-1: 7f85ded7d2c36439320d9266ebd3542cf69c78fa SHA-256: 73964c9f482931dac51e7b6c81fb9ad5ac27a6d3ff57bd3caf2d7d6c2d507ec6
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many pointing to suspicious domains hosting PDF files, indicating a link farm or distribution mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is part of a scheme to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dreamscar.eu/userfiles/file/74085489187.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/fimutabevegepujesotema.pdf
    • http://pspectr.ru/userfiles/file/monazolumefemepisusi.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/gugazumupufokirisijun.pdf
    • https://kaptenhoki.net/contents/files/49390819459.pdf
    • http://gcsiva.com/files/userfiles/file/21446889687.pdf
    • http://www.chubsorn.com/file/files/48238320333.pdf
    • http://tienphat.vn/imagesflashupload/file/3505203768.pdf
    • https://abss.pt/userfiles/file/4029508101.pdf
    • http://flemingdecal.com/uploads/assets/file/famasun.pdf
    • http://zulassungsdienst4you.de/bilder/file/vifojunatolikosa.pdf
    • https://cometsecurity.in/admin/userfiles/file/45759693199.pdf
    • https://nyig.com/files/file/numuwusoxelalalofilamat.pdf
    • http://jainfarms.com/uploads/dezubijiseb.pdf
    • http://2m-m.eu/userfiles/files/zoxepedemik.pdf
    • https://safetypadlocks.eu/eurostyl/photos/file/jasizisalonunum.pdf
    • https://fulzugaskozpont.hu/files/93995168332.pdf
    • https://invest.pl/userfiles/file/nomorexeji.pdf
    • https://satellietgroep.nl/userfiles/files/nudetogexupolupekijanu.pdf
    • https://tort-art.ru/userfiles/file/38682558954.pdf
    • https://vanphongphamhienluong.com/upload/files/fovideferij.pdf
    • https://inprovitargentina.com/ckfinder/userfiles/files/riboba.pdf
    • http://dobre-jaja.com/Upload/file/sepixakibenenumajofufi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=6th+standard+social+textbook
    • 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_off0000b1ca.bin
e4fadc4af2b24d5059b351ad4acd550bd1719b89f9b4e51340b30380d1c447f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 18080 bytes
font_01_sfnt_off0000df6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 16792 bytes
font_02_sfnt_off0000f783.bin
022243ab5a031d1d0f1535ec96dade5a0b11de9695800d798bffe4b37286b299		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 10872 bytes

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