Malicious PDF — malware analysis report

Static analysis result for SHA-256 43970cce59f8dc15…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 12:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d70611d2f40c0a74c4f8ffb7d03c7b9f SHA-1: 895acd3ca0259212ffc06f4af0cc72695cffaa96 SHA-256: 43970cce59f8dc15016d479025ec41a6d0404361796f8bbe8df1bb68774bf4d5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as a phishing lure due to its image-only nature and a click-outward action, typical of social engineering tactics. The document contains numerous links to potentially malicious PDF files hosted on various domains, suggesting a link farm designed to distribute malware or lead users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 69 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.
  • 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://xn--42ci4cc0aric4a6dd7c5af9nef7sg.com/userfiles/files/9386899662.pdf
    • http://turinhotelcompany.com/userfiles/files/govunidijerox.pdf
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/bawetizawevas.pdf
    • https://triatlonshop.cz/userfiles/file/13242959279.pdf
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/vumedezepeg.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ruweketos.pdf
    • https://sd-olimp.hr/files/bomegowivadi.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d15246ec07---7321821567.pdf
    • http://thecuriosityshot.com/46506142817.pdf
    • http://weiken-rc.com/upload/files/bivagekemedowasag.pdf
    • http://tuderprogettazione.it/userfiles/files/sudugawolisifoku.pdf
    • https://hohsingfiber.com/ufiles/files/mexojifirolew.pdf
    • http://agilesolutions.in/uploads/49780231567.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/suganu.pdf
    • https://drinkpoint.com/uploads/files/kigimavuta.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5f892f4fe---rafewoxa.pdf
    • https://emenu.hu/editor_up/45322002913.pdf
    • http://0965818789.com/CKEdit/upload/files/favavomoxabomo.pdf
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/26079305247.pdf
    • http://captainkillmite.com/uploads/files/202109161944075572.pdf
    • http://m-s-g.ru/userfiles/files/sobexaxoli.pdf
    • http://spy-military-labs.com/userfiles/file/99082053794.pdf
    • http://caycanh.vn/images/fck/file/41336778148.pdf
    • http://merwepizza.com/upload/file/woxofeviwosupupamixode.pdf
    • http://np-laser.com/upload_fck/file/2021-9-26/20210926214558651253.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+can+i+see+who+viewed+my+instagram+profile
    • 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_off0000b40f.bin
8c0ec57a1e8391dab6e6fb2197f0cd3c9d0be79dabd041bf3a5c9c6f2409db48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB40F 14088 bytes
font_01_sfnt_off0000d702.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 16792 bytes
font_02_sfnt_off0000ef19.bin
c1ad4f9dde096b50d88d0765621b5f93c43e60c1fc37ff2e37fa11f729f1ba3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 11324 bytes

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