Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce78902dcfffc11f…

MALICIOUS

PDF

73.7 KB Created: 2021-09-18 11:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 808caeaaf80cbf5bf498c64010e7cb92 SHA-1: ecb88773a6d2dd0bcd8b1d1e033e58de07518f2f SHA-256: ce78902dcfffc11fbe8ae449f3556e84d1075d6146f2454520942edac2575247
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://s-oil.hoakhanh.vn/uploads/image/files/51519952968.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/f6oqqm9k1njp3dmmugqn65ple5/pitafuvigane.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/60317006211.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/vamalibunulufafit.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/wosoxo.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/79669736184.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/fevomevigeporol.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/wideviwinijurumesobi.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/5669428642.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/bimugebo.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/28845393786.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/87437192835.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210908185305.pdfIn PDF document text
    • http://linker-apps.com/files/xadelofasawuk.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/82292416947.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/18317823674.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/11476290582.pdfIn PDF document text
    • https://digireg.cz/upload/dunokakiwana.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/vosawosagiwanoras.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cc4c6cf3f---85266134326.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/rerunajopasagidog.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/74559975259.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/54567780546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=poco+m3+miui+13PDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/61182688219.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_off0000b93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93A 18948 bytes
SHA-256: d661c1fe2a41e96fde66b434d7e23367394129f398faeef7617bba5d606594a3
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 9908 bytes
SHA-256: cf93fb5c6818a3d551774dfa6f533cc377e9804aac66c5880ce98e9fc43ba67f
font_02_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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