Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d67eaa0a58192fb…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 04:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12dff1bf88354c200396a558016b5519 SHA-1: 2aad4951a41de321d2e1d210b8e7e43e78d5bab6 SHA-256: 0d67eaa0a58192fb3315d7e16dfca7e745bcc5bde3eeb365b80960e208108a91
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=family+name+given+name+middle+name PDF link annotation
    • http://el-master.ru/userfiles/file/22686440757.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090400120773499.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5408baf7c---86136888250.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/tatizukatilujusewi.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/kusimofasuvixotekebalego.pdfIn PDF document text
    • http://vpsystem.com/files/fck/jiguwukedure.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/mokujoludamogonu.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/74725460278.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/99105264940.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/16572890601.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/72232678302.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/80579867262.pdfIn PDF document text
    • https://music-group-store.com/upload/files/27272461165.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/wanisebixamodiweluvijita.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/bulalovinav.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/95493125784.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/wikaxatibeb.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/vosibimuwo.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/32012932594.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/gamunokozaxu.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/6816705155.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_5F8FC0282C39ADF3.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_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 18320 bytes
SHA-256: f1dfad39f696c74251de75609ea556d6e029dfe133c754ed218cd0992940f7cc
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 10260 bytes
SHA-256: 4da2d1f744762b97a8d17c5cb4c82d322f0e451fbb786364ca00ce5e6170b45a

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