Malicious PDF — malware analysis report

Static analysis result for SHA-256 786f02f7b62d6814…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 10:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f4d43733f7ed8ccb05d362fe176e1e5 SHA-1: 1afd0776eafc619e2ed9a017e3ebb30a2e630abc SHA-256: 786f02f7b62d681421690198e95d3355985294ef78df3d2e3741b031b2dbe405
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and external links point towards an attack pattern involving directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=theory+of+utilitarianism+by+bentham PDF link annotation
    • https://viettincapital.vn/upload/files/wamitujebabuj.pdfIn PDF document text
    • http://adice-area.com/pictures/files/nenuwurutu.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/golutilupusivafufipagan.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/pafukabodubobobuba.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16158f0466f86a---nepenojewelunogogafoditis.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/35152098689.pdfIn PDF document text
    • https://alpinashop.bg/files/33526821790.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/bogezoxulominepokum.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/megowifedoxofezanukitike.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/63215070280.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/28529477188.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/5073692014.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/78452195088.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158d33aafa4b---85099392748.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/62729278259.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/25146009402.pdfIn PDF document text
    • http://jump360.co/upload/files/20210926161413.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/gumanusokedagorokamof.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/xadogotorotiwogovasa.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/60859868682.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/riguman.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/89752420417.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_off0000ae3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3F 15880 bytes
SHA-256: 860679498366f7789d43e700f65575da776ef94a1bb9f62f1c55270bc3c2aa10
font_01_sfnt_off0000d663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 10796 bytes
SHA-256: 2d5252d2ef58ccc997cd5662694f21a56a7603ee6acd4190277e36be8fee8a7e