Malicious PDF — malware analysis report

Static analysis result for SHA-256 434e744e36414526…

MALICIOUS

PDF

69.1 KB Created: 2021-09-21 10:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 874fd2e84af96611917ec80f10d377c6 SHA-1: 6b8bec58d11ce1a99776e218e9a2e05de581ff33 SHA-256: 434e744e36414526d42b38af4610fe93363f6779f653b42bfda976f5c8fdf846
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a malicious phishing or trojan lure due to its structure, containing minimal text and a single image designed to trick users into clicking an external link. The heuristic PDF_IMAGE_LURE specifically indicates this tactic. Multiple external URIs were extracted, with one prominent example being https://wastran.ru/uplcv?utm_term=pes+2020+android+download, suggesting a potential download or redirection to malicious content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=pes+2020+android+download
    • https://taxfirma.com/userfiles/file/38164438617.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/28366547030.pdf
    • http://hainescentreasia.com/images/file/vazajanuburufuwupiwera.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/sujoluvurupavisisover.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/bejodovabazepujoseg.pdf
    • http://nature-revive.org/files/file/fidavafep.pdf
    • https://gitedu.in/ckfinder/userfiles/files/22766665254.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/44948715651.pdf
    • https://madspot.dk/ckfinder/userfiles/files/wisevomiwovowupenavaj.pdf
    • http://www.yoko-ono.be/images/userfiles/file/90473034777.pdf
    • http://medicapoland.pl/uploaded/file/bokesavujezuziw.pdf
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/sezufim.pdf
    • https://taechoclub.com/FileData/ckfinder/files/20210913_E5C910F560F1E81A.pdf
    • http://samwha.com/upload/userfiles/file/59657238723.pdf
    • http://poltinik.ru/userfiles/file/28506579254.pdf
    • http://distant-property.ru/fck_editor_files/files/76797076234.pdf
    • http://megalabsrl.it/userfiles/files/78963768455.pdf
    • https://designclarf.it/file/43393447313.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137426ab37d6---20149758660.pdf
    • https://inijariku.com/ckfinder/userfiles/files/81143353488.pdf
    • http://krasneclanky.cz/uploads/tivagepepamemakizedefutov.pdf
    • http://brenna-ski.pl/userfiles/file/diwutoresevirowoxarigi.pdf
    • http://aaronandanthony.com/userfiles/files/6057994953.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/60919767903.pdf
    • https://inprovitcaribe.com/ckfinder/userfiles/files/33077531686.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_off0000b34e.bin
8aa68974cc8a3035711c71fb57a85f8eea01352550156291d84a29d5bda2f7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 14284 bytes
font_01_sfnt_off0000d6c0.bin
db42463952a359ee7bf922cf2c4b381860bcd98d727da966ac96007787784f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 10472 bytes
font_02_sfnt_off0000eec2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 16792 bytes

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