Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8f7d41b78af8cf…

MALICIOUS

PDF

130.1 KB Created: 2021-09-18 06:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1967f3522e735f9ffc4541a8a21b9aed SHA-1: 2dded7eead46bf6879577c0d7b6cf732ab7e30f5 SHA-256: ab8f7d41b78af8cfedf2032f3e88c2e2317bd0e2d3c90cee70b796b27ce5c0e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external domains, many of which are hosted on disposable or suspicious-looking subdomains, suggesting a link farm or phishing campaign. The heuristic 'SE_URGENCY_LURE' further supports the phishing pretext, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://infrive.ru/uplcv?utm_term=spotify+android+requirements
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/58443715835.pdf
    • https://glozorcom.merlak.ru/userfiles/file/36111525405.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/31891850976.pdf
    • http://liqaa-lb.com/files/userfiles/files/75540230114.pdf
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/2881515165.pdf
    • https://mongolia-volkslift.com/uploads/files/9727962931.pdf
    • https://bbpartner.cz/userfiles/file/ridolagagotesifav.pdf
    • http://union.travel/ckfinder/userfiles/files/sixuwopijabekiwozobovagam.pdf
    • https://investincarpathians.eu/app/webroot/media/files/ruzuxes.pdf
    • http://ubestsports.com/imager/files/20210917065315.pdf
    • https://horkolas-gatlas.hu/ufiles/file/43852544079.pdf
    • http://idroter.org/userfiles/files/7317699896.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/759bc2078c8e67c64bfd27cbbf4dd81d/22840965622.pdf
    • http://robertoantoniz.com/resources/original/file/fejofakivebunidad.pdf
    • http://pm-property.pl/userfiles/file/jetisil.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lq47534ha7ukat733ujk3qtdn7/rujamube.pdf
    • http://avandcie-energy.com/ckfinder/userfiles/files/jalafo.pdf
    • https://vnjhanoi.com/upload/files/padunovubetura.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/xaparikabirodadufikomedo.pdf
    • http://techscreening.com/userfiles/files/19453374541.pdf
    • https://gallerylingard.com/uploads/file/gofofokuwixujutobekutozom.pdf
    • http://farmina.ru/uploads/files/39516629448.pdf
    • https://detector-billetes.com/Imagenes/file/1392589282.pdf
    • https://easyown.ddproperty.com/datas/files/45051462063.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018a22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18A22 16792 bytes
font_01_sfnt_off0001a22f.bin
503544ef312f6daefeea1abf575de4c2478a061187b103fe3a1ead32dab17db1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A22F 2224 bytes
font_02_sfnt_off0001ac1e.bin
5af6d6bc51839913c3512d3c7c27d755769b01ce00f79a948c1fb411792b45e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC1E 11048 bytes
font_03_sfnt_off0001c5a6.bin
f552e3e113a0b08a0deb7d26e597f07063b88e68495777d99f157400112389c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5A6 19980 bytes

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