Malicious PDF — malware analysis report

Static analysis result for SHA-256 c490bac564ab6d16…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 10:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ba417d7e99d1dac028158e885899a9d SHA-1: b89a0a2f774f5a1ac35f00e66ea19a51de33c275 SHA-256: c490bac564ab6d1667ef48b93d4b154223d716180eaf9c667143c77eecca9dec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://otestmanager.org/club/data/userfiles/file/20210914051111.pdf In PDF document text
    • http://master-vin.ru/files/file/71508544864.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/jezorifiwiwinizagebofifuk.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/kowekanenit.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/7311432560.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/resadopo.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/74215784650.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/1694942138.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/zutubawu.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/21388720979.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/zapokamivepezep.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/70875342739.pdfIn PDF document text
    • http://jinyezi.cn/upload/gisonamarolomuguro.pdfIn PDF document text
    • http://ombs.ru/uploads/files/6457571343.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/19850064435.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/tivetimesifosagiwijunuk.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/90418196975.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/81014235026.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/48871697478.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161492d8f6a169---12886500345.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/jotol.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/wejejupivokivemizanuvusim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=puffin+browser+pro+latest+versionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57B 10744 bytes
SHA-256: 658ad4da0b2510251cd384027bef9b6de015491b654c9348cb946e9c9e45c447
font_02_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 17584 bytes
SHA-256: 6c9599053179eef498805c54a37579df35a5c3891af6fe329d958ef6458582be

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