Malicious PDF — malware analysis report

Static analysis result for SHA-256 87863856d69ab88b…

MALICIOUS

PDF

67.5 KB Created: 2021-10-01 02:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c88f306c5f2b2c1cb10451b8bf9766f SHA-1: 98529968b440a34dfddc32640dc4d64d969e4150 SHA-256: 87863856d69ab88b1085eadf4d4c98e30422345b4dfb19cff464793d6bcc2aeb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure by multiple heuristics, including an image-only document with an action trigger. The document body is heavily obfuscated, but the presence of external URIs and the overall structure suggest it's designed to redirect users to malicious content or download further payloads. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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 0 text block(s), carries a click-outward action, and is only 67 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.
  • 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://oniceh.ru/uplcv?utm_term=dragonball+evolution+full+movie+free
    • http://urbanelect.com/userfiles/file/zogul.pdf
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/darelubivupekez.pdf
    • https://aprilboya.com/userfiles/file/23440423855.pdf
    • http://rapabzenec.cz/obrazky/files/gisezolijivoxad.pdf
    • http://kramor.bg/userfiles/file/vorajitimusife.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/78727663593.pdf
    • http://plechotice.sk/tmp/file/45829132765.pdf
    • http://romanakladatelstvi.cz/userfiles/file/seriwab.pdf
    • http://aihyang.com/userfiles/file/9119078830.pdf
    • https://centaur.vri.cz/docs/files/jafetevi.pdf
    • http://93564497.com/userfiles/46671160791.pdf
    • http://mixline.ru/img/lib/file/73023491089.pdf
    • http://creatinglifeoptions.com/userfiles/files/80488827221.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/sinurozovesi.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210920_A4D60613F4A1CEE6.pdf
    • http://schodylux.pl/userfiles/file/8770581559.pdf
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/puzitavevur.pdf
    • http://rosabaum.de/web/editor/files/83890578984.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b581de48d4---kowadorogekesaxezos.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_off0000aca1.bin
bdb9e7346f5f779e364a69e156e12fe41ba27010fdfa01589d0b9aa97f837300		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA1 14084 bytes
font_01_sfnt_off0000cfd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 16792 bytes
font_02_sfnt_off0000e7ee.bin
068cb87c58d6cfa5edd686dc6fce908bb7958777cff17678d8cbf6a72a69d0ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 10696 bytes

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