Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21940032f5e8be6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 03:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2860b7167a73b27ff94fff7c80dd3de5 SHA-1: 573c931574aa681546b9c9b2c1e58cb2f4e8ebad SHA-256: e21940032f5e8be6bf1781edc7df761f9271d8a63d432ccc6b38bdb0b28ef190
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI redirection. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a large number of links pointing to disposable hosting, further supporting a phishing or malware distribution scheme. The embedded JavaScript is likely responsible for initiating the redirection to the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://nomylo.ru/uplcv?utm_term=structure+of+glycogen+molecule
    • https://pmcp-avac.com/files/upload-ckfinder/files/80412258909.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/sodub.pdf
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/51838840771.pdf
    • http://theclubburger.com/uploads/files/zuwurene.pdf
    • https://lawyerupsmart.com/tempimg/file/45195545962.pdf
    • https://bselink.com/userfiles/file/butili.pdf
    • http://pincailight.com/zk/UploadFile/file/2021091401355173499.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/rifaw.pdf
    • http://autostyle-japan.com/js/upload/files/88565359646.pdf
    • http://xn--nellieskche-0hb.de/userfiles/file/80411910817.pdf
    • http://neonatal-surgery.ru/userfiles/files/kapetuwojadik.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce0d5d29e06acfc76491186777f4c73c/88551475072.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/55472164809.pdf
    • http://cbstav.cz/file/namasesatepenup.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210902053854.pdf
    • http://vietsaovang.com/uploads/userfiles/file/10636804249.pdf
    • https://swaarm.de/app/webroot/upload/files/34280300710.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba55b395a---9230426141.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/gixasopixijinakubi.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/31220145821.pdf
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/zujekejipo.pdf
    • http://chothuethietbi.info/img/files/xatemizixutes.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_off0000d77b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 16792 bytes
font_01_sfnt_off0000ef92.bin
252de66864b4279b2c9790e1054b279d8a0800010d956d487c8d49d6275a9b83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 10544 bytes
font_02_sfnt_off000107b1.bin
78c7c8890479c75f6e6dddc0a9c69669b637961f0b3aab41e3940815f4d2b758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 17404 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.