Malicious PDF — malware analysis report

Static analysis result for SHA-256 043d0af8b474c7e7…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 07:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36a43712aa5a45db005040ec4ab7f6b0 SHA-1: 3b1b5f336cd3825ccbc8210a1acb88a0baf68abf SHA-256: 043d0af8b474c7e79bf0d308857468bebf5972b6b22760ea46c401e86e85b289
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF's structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=partes+de+un+motor+electrico+pdf
    • http://aokunoil.com/ckfinder/userfiles/files/31778126874.pdf
    • http://sevoir.hu/uploads/file/kojotajufax.pdf
    • http://siamintertrade.com/file_media/file_image/file/73693169014.pdf
    • https://299-45.com/CKEdit/upload/files/goxuzerezikewiva.pdf
    • http://christmaslandint.com/userfiles/33309591775.pdf
    • https://mertlakustika.cz/images/pages/file/61028583085.pdf
    • http://rollfactorytogo.com/uploads/files/82927680998.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838c289305---12364660638.pdf
    • http://emilygrilltogo.com/uploads/files/loxid.pdf
    • http://pattarasawat.com/ckfinder/userfiles/files/70805408311.pdf
    • http://mt-filtration.com/uploaded/file/20529436856131440853ec7.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a0c23231261f8e3750bb1014c9c1b2b/12983423756.pdf
    • http://simkoongschool.com/uploads/editer/files/47549291518.pdf
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/sujavufavovotisozavan.pdf
    • http://rajasthanmetals.com/userfiles/file/76650066530.pdf
    • http://kurier48.pl/files/userfiles/file/nogajafazinubufedo.pdf
    • http://ranch.pl/files/file/bivarabafetomer.pdf
    • http://onestep-tokyo.com/userfiles/file/xuwinasisagaporenejase.pdf
    • http://cheers-gifts.com/userfiles/ninefukani.pdf
    • https://vinacoma3.vn/userfiles/file/jobuvinuruja.pdf
    • http://rzn-house.ru/upload/file/kisobilidokoturokepifu.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/tigonuwidalumitavuzakuf.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/togobun.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/18839660986.pdf
    • 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_off0000b874.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB874 16792 bytes
font_01_sfnt_off0000d086.bin
07e09929d4f69068922d72f6888db19a06a8d6acef9bcbf49b772089e9f98b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 16600 bytes
font_02_sfnt_off0000f9f0.bin
7ad63bd60b1f811ba801a356f5409638bf0ae94da11f320afe245715b4dedfe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 10884 bytes

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