Malicious PDF — malware analysis report

Static analysis result for SHA-256 317593312a1ef482…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 23:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 386705622d4f0f8db264fd1086ffe4b4 SHA-1: 94c05aea00b5869c6070001b37f886f9c01d6b36 SHA-256: 317593312a1ef482eba42bd37c0bb4891582dc6116a15e8e0aa3624a2f397802
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to other malicious PDF files, suggesting a phishing campaign. The presence of external URIs and the link farm heuristic point towards an attempt to trick users into downloading further malicious content, likely disguised as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=god+of+war+ghost+of+sparta+ppsspp+game+download PDF link annotation
    • http://blankheich.de/images/uploads/file/fopitujunujaxelomu.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/vomasixotagupudak.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134f46e73733---ruxebabigasijo.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/silubelixanukomixerux.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/rogeligidozibazojef.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/weritulokarilanofe.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210901055058.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/wilejoridoxe.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/99057227622.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/levefi.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/visifosisijubixavud.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0a1b01bd5be28e0519412034cab1a313/32372870681.pdfIn PDF document text
    • https://soechi.com/userfiles/file/2312844504.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/12247071767.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/zuzututejepikusomesidi.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210908233155.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1630545277.pdfIn PDF document text
    • http://axwelindia.com/uploads/97107943277.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/6417127892.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/66982956554.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/23558041187.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xafewilolalewekefapumoki.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 10980 bytes
SHA-256: 2418097cd6df6bf68262e1577ef73cf83df6a7b642da0d4b7e9c708b4acb5728
font_01_sfnt_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 17268 bytes
SHA-256: 0d031b8db747d3d3cf854170c4fe42e6d01856f929d7c39313a13463070a878d
font_02_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1