Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33dc8c2a8afe994…

MALICIOUS

PDF

96.4 KB Created: 2021-10-19 06:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 222d8eaf82fa376662cf309a96c87b93 SHA-1: 32b211b55a39dd7cee2419870c068ebd8c24b1c4 SHA-256: c33dc8c2a8afe9940fd94878f617a406cd6feeda31db309bb60cf2b70d12b86e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs, suggesting an attempt to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=what+are+the+5+parts+of+natural+selection PDF link annotation
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/979bf1c158afdb368fb1a41b41e04af5/61715160127.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161661c1c42f9f---wukoz.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/dotimoviladimit.pdfIn PDF document text
    • http://dogable.de/userfiles/file/muxarodanizazavadatilivo.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/13594790998.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/monirop.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/tafikesalemopuxixozejed.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/99053607718.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/xebabudegivoropavabuke.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/firixapekejavajigojev.pdfIn PDF document text
    • https://terracell.pt/images/file/86923360947.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/rodepakavinepifomafi.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1616369d02afa1---gofexutarevoxugojolow.pdfIn PDF document text
    • https://ijp2.com/contents/files/21294527968.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/6735962047.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/zerow.pdfIn PDF document text
    • http://bochkari24.ru/pic/file/75063349987.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/berelojabipajixogopaso.pdfIn PDF document text
    • https://longhoang.vn/upload/files/morupelibuzolabu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/63373030107.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/xuripeputuzowibawivulofu.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/94896912900.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/wugizexe.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_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 19752 bytes
SHA-256: 9b9e3b194a7a851233905c6b3ae24a052e61f3e3fd090ff7786e5bd9a37d8669
font_01_sfnt_off00014325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B3C 10804 bytes
SHA-256: fd09b6621219ca474b1a4e73e50aefac16b1bb688e48282207d18ed85bc5ca14

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