Malicious PDF — malware analysis report

Static analysis result for SHA-256 102449e38ff3697d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 18:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 066057efec077d7db52f16df09be1f35 SHA-1: 237ebaa0876c1a6214db66226079576c05d4e795 SHA-256: 102449e38ff3697dcd9f2d2cae60f4e2bc0bb64ffe2f6a3a11545783ea7bfdb3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript points to its use for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yuanjen.com/ckfinder/userfiles/files/fageva.pdf In PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/66958408177.pdfIn PDF document text
    • http://foodexgida.com/uploads/files/jutakoger.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/zutiwisoxupobawago.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zatoturuxupuwa.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/wizojemugeku.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/nekowitaxugalapeg.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/11435977219.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/46894279088.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/89647863120.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/bixopiwumelavusosenarire.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/6766435366.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/mejugotal.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e834f56---67916964201.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/bokefururitumisigedukud.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210908171337_zt10u2.pdfIn PDF document text
    • http://carbontuning.ru/file/71348752550.pdfIn PDF document text
    • https://fishuntpesca.it/file/85687346591.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/sakuburirurawonejosoluba.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/60004114908.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/zaguxe.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/zivefegulanumajelawef.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gb9d2a6j6k0u23lqu45qovldm4/5942831602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rearrange+pages+in+pdf+onlinePDF 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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 18108 bytes
SHA-256: 0f8bd2a4f5d743033aed376193947b7e2ad4d37dc0632fe87ae6597cde62caf1
font_02_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 10620 bytes
SHA-256: 5dbb9e007f25f234bf7bc4af4efa7c67c4881677c3474c5954209f3e11d542f4