Malicious PDF — malware analysis report

Static analysis result for SHA-256 89553256455285e6…

MALICIOUS

PDF

95.2 KB Created: 2021-09-21 10:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c255e92e69357b9341d7bee59e39045 SHA-1: 800ababfac9c1e14886f70976e4f5c6cc465d362 SHA-256: 89553256455285e6be590ddadf0531f0ebb0f88ef9bafa83e098a2155219dc2b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of URLs, many of which are classified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • 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.
  • 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://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613634e331f61---2016721809.pdf
    • https://wineart.online/userfiles/file/pasevejiz.pdf
    • http://magicfood-cn.com/files/20210921064241.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/xanaregubowu.pdf
    • http://baocaosudanang24h.com/uploads/image/files/dumos.pdf
    • http://www.fonfe.com/uploads/files/kigoxuvusupoxoru.pdf
    • http://planbmedia.hu/files/76235989231.pdf
    • http://laihoawedding.com/app/webroot/upload/files/13361300169.pdf
    • https://havadisname.com/upload/ckfinder/files/93049167824.pdf
    • https://mrdak.cc/uploadfile/files/79181753074.pdf
    • http://paoladebenedetti.eu/userfiles/files/nesonitesopa.pdf
    • http://archidaldegan.eu/userfiles/files/ravikewegilunutipopubi.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/dazojejiruwup.pdf
    • https://tsydesign.com/userfiles/jws/files/41453375685.pdf
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/jekanagobonenipimiv.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141aee8633dc---xetodojipofedi.pdf
    • http://cariboohose.com/userfiles/file/neriluzasulufabo.pdf
    • http://realfootball.gr/userfiles/file/wimutawudafitetowif.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/ginomuwurigazuwagaluke.pdf
    • http://eko-uklid.com/files/file/tasopobuzidav.pdf
    • http://cpk.by/ckfinder/userfiles/files/8505275612.pdf
    • https://olboihorgaszto.hu/editor_up2/wuzekexomesaxebawup.pdf
    • http://shiinamotors.com/js/upload/files/49501242799.pdf
    • http://oishisushigd.com/uploads/files/13686818771.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+san+andreas+new+cars+pack
    • 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_off00010cc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 16792 bytes
font_01_sfnt_off000124d9.bin
a95681f7b20dc8cdf3d9d4a1d5036a45ebcc80630590097b9606dfa5c9fb1a84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 10468 bytes
font_02_sfnt_off00013cd9.bin
40a3bfcaaafbca78f95c287351510f7c72772e22f30232485699c46eaa43b24d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD9 19460 bytes

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