Malicious PDF — malware analysis report

Static analysis result for SHA-256 d744fc4249fd36e7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 15:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22367b6e1805798a73ef9b1b010379a9 SHA-1: b2372179c90404fa467d3e9ddf83b6c31c7c3b59 SHA-256: d744fc4249fd36e7e1721b0b648d5daee0aa6b441ab2034fec4e5e0f51c47286
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links on disposable domains, likely for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://namngonviet.com/user-/files/76431990807.pdf In PDF document text
    • https://hondaotohaiphong.vn/upload/files/67041066909.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210909094913887941mfdls.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/5080220581.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/vivasevonozubefejepovuras.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/13666212091.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/37605530913.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9b13ecd74---86976948043.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/numumowuxog.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/mubadonilebex.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/58514175420.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/sapepinibimufunilotawuti.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/vibutonegakati.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/79092023760.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/36834112493.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/fabixilude.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/watotu.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/91476748206.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/47194568901.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/vejudewisosebigojukofomaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=123+movie+wonder+woman+1984PDF 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_off0000ae47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE47 15212 bytes
SHA-256: 707c80e70348806d322afce2b5de2e5f8b7b7d10acae9adaf9202dfccaf79e03
font_01_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 10952 bytes
SHA-256: 6f523675aadcc297028c4c0877cd7ac8563dd40a64fabdaa8025303931c9fc60

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