Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b6e212580a0333…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 12:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ba0b25da856daeaa4468b10d7d7e5a3 SHA-1: 3a6a719973818e824847ebb798b687315905f2ba SHA-256: 92b6e212580a0333a270d0940b7b8933187eb9aaab633bdf696c64e87850cf4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to PDFs hosted on various domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://monteconsultants.com/image/upload/File/rawoniledadejaxa.pdf
    • http://ghettaetamionarchitetti.it/userfiles/files/divor.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/zulatesepudugoxa.pdf
    • http://wadsoda.com/UserFiles/File/94144698733.pdf
    • http://silverspringabw.com/uploads/files/zewiferirazi.pdf
    • https://kemxoi.vn/app/webroot/files/images/pages/files/15742767325.pdf
    • http://archissimo.eu/userfiles/files/fitanabatizekafoluv.pdf
    • https://parklanehotel.asia/userfiles/file/duwoxuxif.pdf
    • http://digifast.cz/userfiles/vuxefivufavosagozilaxerox.pdf
    • http://sineadstone.com/userfiles/file/kowukatem.pdf
    • https://melnikhouse.com/userfiles/file/kapigexo.pdf
    • https://highlander-inn.com/assets/userfiles/files/kaxalowaluzasataxegav.pdf
    • http://sanchariglobal.com/userfiles/file/teluxogavid.pdf
    • http://ranaghatpchsschool.org/userfiles/file/sazulukavegodarorizaxupiz.pdf
    • https://triosms.com/userfiles/file/jonide.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/47796818068.pdf
    • http://ultrabeauty-ff.ru/userfiles/file/29884482128.pdf
    • http://geoodwierty.pl/files/file/4752678686.pdf
    • https://queensflower.nl/clientfiles/xufufofaf.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132832aa7d1d---97820010474.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614a060336db5---46880283203.pdf
    • http://goodtraefarm.com/ckupload/files/zulujazabavanogav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gta+chinatown+wars+apk+obb+download
    • 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_off0000ae10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE10 16792 bytes
font_01_sfnt_off0000c627.bin
5d83083586d5330613904e9b30ffd9732147a2b8a4a15f0de05e10ff6c799a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC627 10836 bytes
font_02_sfnt_off0000def4.bin
a0d38e743779f327fab1b255284d55fc3e5bf424ddb91ea4681a013591766404		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 15156 bytes

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