Malicious PDF — malware analysis report

Static analysis result for SHA-256 f599e9b4ed0faa23…

MALICIOUS

PDF

83.7 KB Created: 2021-10-06 11:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87569e612924f2ff7f2ca07eb4190a63 SHA-1: a8ca619a9d1176aad418fe73b93393f837e3aa16 SHA-256: f599e9b4ed0faa23ab253c17a222f5380f4b6531e629344d53675ce5fd40804e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, potentially for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hf1ptfkb3g9lv4k6rahq1kk72e/gebufidufeletaw.pdf In PDF document text
    • https://ontogepszerviz.hu/editor_up/riwapurobedegofepaw.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/tifuxabo.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631612515.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/17632995815.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/lidusitovokibirulaxug.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16159a79ae6ad1---lolajomisoga.pdfIn PDF document text
    • https://denis-lefebvre-services.com/fichiers/file/85856168630.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lazorolexiwix.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/53351309183.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/mopolivinotixomer.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/gobidifajesowoxoniregud.pdfIn PDF document text
    • http://tiquital.com/documentos/file/rojatojit.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/11789642301.pdfIn PDF document text
    • https://pkbae.rs/files/gubesedupobi.pdfIn PDF document text
    • http://woykoff.hu/upload/file/37221325198.pdfIn PDF document text
    • http://anm-av.de/uploads/files/19890104734.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/81898915981.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/40956105300.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/1091824373.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/dodurilabijuwatatur.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/57440099959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=current+income+tax+bracketsPDF 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_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 10808 bytes
SHA-256: d31e877b05dd8fa833f7582d485857179ebab20dd0ac40248e0b3ab26ebf440d
font_02_sfnt_off00010ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA7 20712 bytes
SHA-256: 6b63bb58933c6ac3640dbaaf90363c273bb4dd6043db489986db83c2f99298e1

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