Malicious PDF — malware analysis report

Static analysis result for SHA-256 422bbd151201f9d5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 17:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64e2a03b9db9b5678ae754f53e4151d6 SHA-1: 00427252728136a51ada5c3ed07fb21df56f6e7f SHA-256: 422bbd151201f9d513cdc47bb754e55134a777e3d251db4fdd325507be0d72e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://rh4-h1tapi-turbo.com/contents/files/tutatilajitijimudun.pdf In PDF document text
    • https://augsburger-dartliga.de/uploads/file/fusudakekubipinovuwiga.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/52173880490.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210911195710591085x9ovy.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/62832571747.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/93367413695.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/savudiwuladenasugulaj.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf0cc1039---84245138276.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/girubutevetudaxebirofak.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308604579422.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/larak.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/66614990795.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/90592050382.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/19818077098.pdfIn PDF document text
    • https://ambalatender.com/upload/files/23483097585.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/dc0040ebb2af2cb8f7d4ff8d97900266/jaliwezes.pdfIn PDF document text
    • https://akconta.com/uploads/files/gavajixawevame.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/34409787003.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/68002519083.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210909_50146A333B29D024.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/56360114470.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/jegaxalunowivimagaxatep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=enable+unknown+sources+androidPDF 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_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 10664 bytes
SHA-256: b3ba8f0cf46e5fa6131c95aa26446c934463f910e5698675d4e65c3d88dae301
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 17956 bytes
SHA-256: 92ebb961eae47a8594de8c627ad2f27be1c947dff315024e01687e7f88909dd3

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