Malicious PDF — malware analysis report

Static analysis result for SHA-256 f305f99a449bfed1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 18:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57cbf45a4d54123f86ba757e7e4d2041 SHA-1: ab9772efc6094ed58dce77997bb958b0242a6b2f SHA-256: f305f99a449bfed16c2add5a9c8c43aca17eb5ba49c060f59c705fe8cf587aec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to further malicious content or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dom4m.de/userfiles/files/ginekamuzigevapevivirevo.pdf In PDF document text
    • https://khambenhxahoi115.com/images/files/zosikafopek.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/40194182759.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/61363557004.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/92985484880.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/puzukav.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/145bd225cce601cdea1c4807444d2860/tirikadubojesolujodosetu.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/10795907068.pdfIn PDF document text
    • http://mweb.cz/images/file/43176012726.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/99088723862.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021911207161951.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/83803739548.pdfIn PDF document text
    • http://watch62.ru/files/files/19533086499.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/94884366242.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/fagaru.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/wivaguxagoxosonexu.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/50034436672.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xafomafezipixoni.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/jobemenugaxabaxepal.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/15935509131.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/wowede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=connecting+two+bluetooth+headphones+to+androidPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/15629350877.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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 18448 bytes
SHA-256: 7320e24a127f295b86b3eb200be35551574760e06bc8a59dcd94330b3fa76656
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 11152 bytes
SHA-256: 6b5e2d2791fa96030ce107bc710e62705852788a7ac1cf932983c6b7e5bd4797
font_02_sfnt_off000125a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1