Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b965daca7be7a8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 16:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3bfbdc61f61be931ee75b5437db17631 SHA-1: a2c5f57e32698d7daf6c7487be1357a78a4692c9 SHA-256: d5b965daca7be7a8b21d7ed90583a3f7f457b9cdca75568029b63f4801089216
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a tactic to obscure malicious links within a large number of redirects.

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
  • 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://infrive.ru/uplcv?utm_term=sonic+heroes+unblocked PDF link annotation
    • http://dreesmann-foto.de/userfiles/file/67887719754.pdfIn PDF document text
    • https://network-italia.com/file/rolizopivo.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/58466374563.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/54381280712.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad2618922---76636256825.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/luposazin.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/kugitoxinador.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/14738709402.pdfIn PDF document text
    • https://novitas.ro/files/32353127893.pdfIn PDF document text
    • http://retailcop.ca/files/80974003053.pdfIn PDF document text
    • http://chamdure.com/DATA/files/fixapiwuwefajofurid.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/gunadad.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/tiriwejelodurus.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/85328516482.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/92952110173.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc5f650827---fiminoruwimimogipejelurof.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/kagedefisasisokoxan.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/27944327857.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/15837345306.pdfIn PDF document text
    • https://promise-land.com/upload/file/tizusirefevu.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/jojubuw.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/5762899386.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/30772243426.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/mebedezesa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 10616 bytes
SHA-256: db19834b41c3d786c58af7d4978bf2ce06f365cb415d26d29e90a1a9bc2210ec
font_02_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 15104 bytes
SHA-256: 9d0a25dcd34125dd4e59179e09bd2ff5971cef46505678d42889c226b3d65bc0

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