Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9fa0bc5ab84e42…

MALICIOUS

PDF

99.8 KB Created: 2021-10-06 18:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee7fdc758e04276a513e5f79bab5c337 SHA-1: 4a0cce8b495ebcc9bd5c1b4479030f51fdfe5c7b SHA-256: dd9fa0bc5ab84e42ecc4b539b487483a2359defe9c2f729a08383a8931918f88
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript, indicating an attempt to execute code within the PDF. The PDF also acts as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://zapatosperezcabrera.com/ckfinder/userfiles/files/45935210922.pdf
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/22199515490.pdf
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/47891000017.pdf
    • https://yp05.com/_UploadFile/Images/file/96001327428.pdf
    • http://asia-test.informacittadino.net/media/files/silebibawulunudo.pdf
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/24165856900.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/44945287476.pdf
    • http://aec.dbodm.com/js/upload/ckfinder/files/18273122965.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/mivowixonivelaxidi.pdf
    • http://www.zywawiara.pl/pliki/33880549471.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613099b680927---gekuwariwuzexig.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/56981738821.pdf
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vivoxagajixetoxefop.pdf
    • http://dhalahoredeals.com/survey/userfiles/files/zedibuz.pdf
    • http://gazdalkodjokosan.hu/img/userfiles/file/80474518359.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/79438ed3f09453ac204d64fb5a72c939/pogenafimuza.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/xogerakomiwubevogefus.pdf
    • http://nigerseedindia.com/uploads/zaxinufa.pdf
    • https://classoft.ro/userfiles/file/58431743834.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/zopumakibefane.pdf
    • http://jgweld18.com/UploadFile/file/20210901202436617.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/lotavirugedibapojitijizaf.pdf
    • http://vanillasky-ch.com/images/files/53235271629.pdf
    • http://tabletopad.com/images/file/xuxewilawuduwofijuvo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pied+sided+corn+snake
    • 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_off00011a83.bin
e04df47195ce1cfb3557a6aa459d10f6968fbfc953f8d255ab8a6c8fc936c174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A83 10312 bytes
font_01_sfnt_off000131db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 16792 bytes
font_02_sfnt_off000149ed.bin
7db68f2f43412b982365f925b8e4310bb4542a6c2fbfd8a805d28de0b13a5097		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149ED 21668 bytes

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