Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71e11323c93501c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 22:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc21bbb28475a6f8eb87e9d8c213a59b SHA-1: 3a0e62b96be0dd03fb0dde9ea877dfab70f29093 SHA-256: d71e11323c93501cc3d343c0898a1e83c1b98675c90bf222b5f6ba1d64bda0ae
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://triple-a.co.th/ckfinder/userfiles/files/jineviluxokenizilofulusim.pdf In PDF document text
    • http://hycxchina.com/filespath/files/20210910011154.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/xirupupuzifaditow.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/2401822806.pdfIn PDF document text
    • http://arablift.net/userfiles/file/pazixojuz.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/dediz.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/17162508532.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/nijikizugorogomizutiziguk.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/89538468476.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/kuwevu.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109062138223853.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/82342393527.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/vogalir.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613431d85de91---43422255015.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/550ea053eaf5591ca98f57cfe9f336e3/kifelimigivavavoji.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/6538782168.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/fabiguwusedagumijux.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/tobugetivozelis.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/bejavubujifefewifasajigud.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/21930659427.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/90177398928.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/98636262311.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/zawanokudinoguwuzoxe.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/fepujaxikevowutapubena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+wealth+and+poverty+of+nations+pdfPDF link annotation
    • 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_off0000b9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 10824 bytes
SHA-256: 69f6df88ae197ce2e2e580abdcf55c25e2d7baa468b7abc977185db6cff84a88
font_02_sfnt_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 16412 bytes
SHA-256: 49d389e02905293100fb4d57794599bed0109e7a1a8ddff4c6cfded290fd94c8