Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a8a08bc9e2bb60…

MALICIOUS

PDF

74.4 KB Created: 2021-09-11 07:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f719ae173162419afb5cac1d7a4507f SHA-1: 90a1dbace67848ac476d18eabb4e65ded3dd9b99 SHA-256: 91a8a08bc9e2bb60bcb45e06e3d6ccfcceeddbe5876e76eafa1589ec023f1d21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with many pointing to disposable or unknown domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers identified the PDF as malicious, specifically flagging it as a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to malicious content, likely through embedded JavaScript or by exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://legouic-peinture.fr/userfiles/file/dejupewisaved.pdf In PDF document text
    • http://pnc21.com/files/fckeditor/file/1764782528612eb4e5e8ead.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/xolodetug.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/45766786154.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/31481608487.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/jevadulibexowubasoxojope.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lurak.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a4b614e4---bosevaza.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/nibemut.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/36295407081.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/17722014465.pdfIn PDF document text
    • https://goodline.by/userfiles/file/84515926755.pdfIn PDF document text
    • https://redac.ch/upload/55974310585.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/47320325678.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/96072776777.pdfIn PDF document text
    • http://elpijisystem.com/file/69044510764.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/pukovegufakaxajekuvor.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021090811574973499.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/59007021903.pdfIn PDF document text
    • http://screen.by/images/file/76643015154.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/37351193891.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/15819820326.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/24042067757.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/22155402693.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/wipatinixogesidex.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/97465439955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+game+bully+ppsspp+android+isoPDF 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_off0000bdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF4 11076 bytes
SHA-256: a3d2d52b25f3a2d04efc55d83bb7311e88e36567359db84a770d400453a77d4a
font_01_sfnt_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 16836 bytes
SHA-256: e9c84a57fbd4903ceae903ee94e1dd581d4f9ab01eec7b1bc6b9c479d5aa2153
font_02_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1