Malicious PDF — malware analysis report

Static analysis result for SHA-256 a989853a499e8a4b…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 07:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 121ce312f8e24c3084263e45dabe7700 SHA-1: 99b77a066b3817701e5b82be62da8135f4404425 SHA-256: a989853a499e8a4b48201f69066c77bb6f5b2b5e31f5131ef38dfcd5455b4db3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs, including one that appears to be a lure for 'gta 3 cheats'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure and embedded links suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=gta+3+cheats PDF link annotation
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/11c3774c0e9ec5e2ffd600f260014359/17570070556.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/79048231322.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915063524700596vpnphgm2omal.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f069ad8a61---78996350437.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/60227377881.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/fuwinefakep.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210917200233.pdfIn PDF document text
    • http://vhktn.at/images/content/files/gopol.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/wikililemumodipabar.pdfIn PDF document text
    • http://househouse.it/userfiles/files/gedukolawe.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/28971703046.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/89994056558.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/salewinurawanuxi.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/46722644661.pdfIn PDF document text
    • http://mobitransjogja.com/files/zujugukijaxogonulat.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210907061024.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/72567766617.pdfIn PDF document text
    • http://kaies.net/upfiles/2109051900280051821xw840.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/jotatebetuvux.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/sekefubovaxulivujate.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/54515081610.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/28105718361.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/loneditolufatelibivomufam.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/bolenedamexulevusipa.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_off0000be07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE07 16888 bytes
SHA-256: eb2608ae30993dbc98d47604a5956f2f32e5780be654dbb20995bd2d838c5c57
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 10076 bytes
SHA-256: d6e796e960d3460a924dc41cb94437dd327e9575298b7e810bba438685bef8f2