Malicious PDF — malware analysis report

Static analysis result for SHA-256 893b971ed828f5ff…

MALICIOUS

PDF

69.4 KB Created: 2021-09-16 19:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 625c693ce122e0fb973c51e9af7b776a SHA-1: 73f1b340da8a9f5b851e9b8689e01967ab0e9d72 SHA-256: 893b971ed828f5ffbf0f0222ec46c06b4aa1f1569a79b9ad6997426e2bb5a863
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a clickable action to an external URL. The presence of numerous external URIs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to lead the user to a malicious site.

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 https://crysiq.ru/uplcv?utm_term=magic+kingdom+for+sale+sold+pdf PDF link annotation
    • http://coinproject.com/userfiles/image/file/tufimosarifenokomatiwebe.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/31091743284.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/vozamigevodajaremafidifef.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/58096399486.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/46788117782.pdfIn PDF document text
    • http://allasclub.com/campannas/file/14303934326.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/vunalopamewu.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/54465458473.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f823b36cc90ac11edf5a83fd9bc6944b/venujalovafejonizolaxe.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/xoxigivexowatolilupij.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/83290087324.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/87533868434.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/wufenetisimutukomusugekak.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/96474261422.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/25154495176.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/31998576539.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef49241167---mived.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/89270772982.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/netor.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/7880144318.pdfIn PDF document text
    • http://klinok-saintp.ru/files/80474446554.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/37449768406.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/13945325586.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/koredetux.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/komiromowamobidovuxefodit.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_off0000b40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 13988 bytes
SHA-256: 75224282fb8660e420683320b32e80571c6f855048ef588262339bcb6c7388d0
font_02_sfnt_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 10952 bytes
SHA-256: 1ec45542f572dca25b236846a549c2dba585a359dc96abd50e0168ec27d9e7a1