Malicious PDF — malware analysis report

Static analysis result for SHA-256 81072084eab58a09…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 11:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fd4a4996bd0c552b840b863c7306396 SHA-1: a14f0221ee1e025c8c3f5e6da942f9478d5c8646 SHA-256: 81072084eab58a0981d986bd1538f9aaae5c07327cc3adc70adad919a69c8de8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a phishing trojan indicate an attempt to deliver malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://elmaga.lt/components/com_mijoshop/opencart/image/data/files/16858360824.pdf
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/pidenilugokanudixodozidu.pdf
    • http://kalmi.ru/upfiles/files/26955444825.pdf
    • http://etpatatietpatata.com/userfiles/files/faxapeterixadimepaw.pdf
    • http://educasters.co/ckfinder/userfiles/files/pagij.pdf
    • http://recko.ru/ckfinder/userfiles/files/jidijuwewixoxiz.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/40652946973.pdf
    • https://theurbanthinktank.com/files/raduzixuxi.pdf
    • http://interroadholland.nl/userfiles/file/wabolovokutixerul.pdf
    • https://ganganagardentist.com/userfiles/file/ximajevolenut.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145846696aad---pirazitutukoteza.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/xutigajofigunevedagav.pdf
    • http://hophungvietnam.com/app/webroot/uploads/files/86924886330.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/jarip.pdf
    • https://pmapmc.com/userfiles/image/files/56848904506.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/51803644657.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403bbe2c306---13253643604.pdf
    • http://leasingtowers.com/ckfinder/userfiles/files/guwuzot.pdf
    • http://notariocprietoa.com/notaria/documentos/files/xavetaximewibubir.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/nawupu.pdf
    • https://securitydm.net/slicice/file/92488954108.pdf
    • http://lemonsport.hu/upload/file/56986286485.pdf
    • http://s4l.vn/storage/ckfinder/files/watisemegok.pdf
    • https://tresonance.org/uploadfiles/69138976435.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=a+polymer+having+rubber+like+properties+is+known+as
    • 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_off0000b855.bin
2ed2201ea9505b87fdadc5b44510737df070c380aa94aedb7a3cc79794fddfc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB855 15816 bytes
font_01_sfnt_off0000e076.bin
77ced547a2139d072b0e83e931a0fa7516f03a0deefa905162b013f6e5e958f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 11280 bytes
font_02_sfnt_off0000faac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 16792 bytes

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