Malicious PDF — malware analysis report

Static analysis result for SHA-256 9940e7b3e860fca2…

MALICIOUS

PDF

83.9 KB Created: 2021-04-03 23:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2aedced7b4432519d7e6775b4186cdba SHA-1: 8acc25fa5ebbb518b79fc53d569f5915409ba519 SHA-256: 9940e7b3e860fca29830c635d13b9cd0d64a7d6c7107fbac4ac2062e2458b2d8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a heuristic firing for a browser extension/update installation lure, indicating a social engineering attempt to trick the user into installing malicious software. It also contains numerous external links, some of which are part of a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The presence of embedded JavaScript, though obfuscated, suggests potential for further malicious actions such as downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://vilenefex.ru/wix?keyword=the+crucible+act+one+quiz+answers
    • http://impergamon.com/taco_bell_chicken_quesadilla_nutrition_facts079rq.pdf
    • http://xibawolafubiz.getenjoyment.net/danby_mini_fridge_parts.pdf
    • https://medijomozu.weebly.com/uploads/1/3/0/7/130775841/d5b8fac.pdf
    • https://ronalowo.weebly.com/uploads/1/3/4/8/134872729/mezovagiba_xilufejavuvizaw.pdf
    • http://gagitevanonuti.mywebcommunity.org/afrikaans_dictionary_free_download.pdf
    • http://dipenoguzel.sportsontheweb.net/12859854950.pdf
    • https://lesesagipamagaz.weebly.com/uploads/1/3/0/7/130739561/xojubiwelu.pdf
    • https://ziwuwozapa.weebly.com/uploads/1/3/4/5/134517717/235d896697f72b.pdf
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/wufisobi_fozuzixegagetu_remujezepofef.pdf
    • http://chambreop.xyz/hp_laserjet_m1212nf_mfp_scanner_not_working8kmoa.pdf
    • http://kalowodopole.mygamesonline.org/l_adjectif_attribut_et_pithte.pdf
    • http://dogalijun.scienceontheweb.net/asturias_leyenda_guitar.pdf
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/mulusizemerago.pdf
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/likidoteva-xifivevuta.pdf
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/fosome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_63cc89b17eed4c509ddfda5336855c54.pdf?index=true
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_56c9a928650248a4820cd0ed1c351c25.pdf?index=true
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_8f8a55e425c048f19f3226cfe6492647.pdf?index=true
    • https://s3.amazonaws.com/legesiliv/solution_manual_-_fundamentals_of_physics_extended_9th_edition.pdf
    • https://s3.amazonaws.com/juzowilipi/i_would_appreciate_your_answers.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_94ddd524013b4291bed6e1fc0645266c.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010749.bin
6eccafc1a571222a7108f56259b70e23de2f2642eb14db04fb5f427b666f76e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 5244 bytes
font_01_sfnt_off00011935.bin
c0ff1f5b148cc355fbe1b49e79082fceac2e5d2149004dfb1e75b88002db952d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11935 12216 bytes

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