Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde61bdac5c061f1…

MALICIOUS

PDF

83.8 KB Created: 2021-10-09 22:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc4260ff2265d5e75d795fff483212ed SHA-1: 6af1382730465b8d29b9897544829882e5720320 SHA-256: dde61bdac5c061f1cbf2ce82792345239fec5c5682e9760088b8966cefe4bb43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript, which is often used to redirect users or execute malicious code. The presence of numerous external links, many pointing to disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=jessie+saved+by+the+bell+now
    • https://tolgyesvolgy.hu/userfiles/file/surutevozesixogaxawimun.pdf
    • http://pathtojanna.com/userfiles/files/15561512921.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/paxapujebidimeti.pdf
    • http://lngpetro.com/userfiles/file/71095516533.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/36948438859.pdf
    • https://sanghvicranes.com/staging/media/jafuvubovatox.pdf
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/xefozapisivivarase.pdf
    • https://kultmotor.virtualbodybuilding.hu/images/files/pezifepurilezosivivefisum.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/49eajmlo7gril5oho97pudj997/pagaliremixinajaxejuler.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/46e641ba7dc597aa0a733ebb1c5f0164/davirezuxixu.pdf
    • https://pottoka.info/files/galeria/files/83867119687.pdf
    • http://eternaseguros.net/files/files/84741975077.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/fefegimoko.pdf
    • http://ronaldtan.nl/images/photo/32274413785.pdf
    • http://safaraval.com/basefile/safaravalcom/files/sewevurafo.pdf
    • https://dehayemek.net/upload/ckfinder/files/47237500365.pdf
    • https://pristineleather.com/userfiles/file/89112662362.pdf
    • http://buren-kompanie.de/userfiles/files/masuni.pdf
    • http://pepinieres-soupe.com/userfiles/file/35734641412.pdf
    • https://owop.challengersports.com/userfiles/files/12364636331.pdf
    • https://pankajplast.com/ckfinder/userfiles/files/15620975948.pdf
    • http://all-premium.com/user_file/files/82904011447.pdf
    • http://fantasymusic.it/userfiles/files/tedetefan.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_off0000de51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 16792 bytes
font_01_sfnt_off0000f663.bin
b064f4750b0e783a490907f57eeabcef5fda95deb22f99c6d701c94d54d7a40b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 19484 bytes
font_02_sfnt_off00012915.bin
ad67ccb644e0f7885c1bab6027d86780a38f5c0a6af59ae2e1fd8899fc6dbf3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 10640 bytes

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