Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b01b1427690a9d2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 10:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ab964258bc202b118b11b6d9264a11d SHA-1: 5b0b188cc1860ae30c51f13219895bcb48dee188 SHA-256: 8b01b1427690a9d2c92df7818ed101930e725539a94b2c248713dc6c38221c1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=physics+syllabus+for+waec+2019+pdf PDF link annotation
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/bidumedugojo.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/54542008495.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/19743592206.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbc25e5a2---2892991320.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/sujalurowifari.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/15873991671.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/merisumefosowulix.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/68517952135.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/63607554370.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/24555068650.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/7c43354f1a5e3f0165502109530f4c2e/7332664752.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/xetix.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed1133d548---deferifafumezugudatu.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/71671850976.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/62339959158.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/xanep.pdfIn PDF document text
    • http://didula.com/img/file/jopusof.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/22428955282.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/59796830863.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/78119167161.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/15672746053.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/difunisuzoba.pdfIn PDF document text
    • http://birdviewjoey.com/webroot/uploads/files/vafixojorog.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_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 11416 bytes
SHA-256: 7f6c64f5728d848aaa060dbc452dd28a8292e70193aafccdc29d22d9acf3046a
font_01_sfnt_off000102ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 17976 bytes
SHA-256: d880a89fdb51fc93c708d4bd0d39668c8135cc7d3f747ef8e351c0834270310e