Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4bd03e36d03f36…

MALICIOUS

PDF

71.5 KB Created: 2021-09-12 01:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4af6963550795b6609c27044e24d47d8 SHA-1: 2eae0b6b4c6f7544a4a02e69599567138c0f7c27 SHA-256: 4d4bd03e36d03f36803d7c8eab7072ca4f4806624a1d328c63eb54df5e56fb0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to potentially malicious or disposable domains, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external content, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_221610.pdf
    • http://pescepiana.eu/userfiles/files/37212208036.pdf
    • http://lepal.sk/ckfinder/userfiles/files/87047565632.pdf
    • http://edmo-cars.nl/images/file/retiroxagufinerabikuxi.pdf
    • http://studioscoponi.eu/userfiles/files/puduled.pdf
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/ruzuxegalumuvugalesim.pdf
    • http://kimkhimientrung.com/uploads/image/files/baxuzuwego.pdf
    • https://barcelona-health.com/files/galeria/files/43600470158.pdf
    • http://skkl.cn/filespath/files/20210910062305.pdf
    • http://cuacuonbinhduong.com/upload/files/46237461327.pdf
    • https://drhuanghair.com/uploads/files/202109072350458515.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/16536151112.pdf
    • https://2winit.com/Files/files/xodikotufomozijamokakodox.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b05efaee95e8a4ce140e5f5d31a3aa43/48372847400.pdf
    • http://countryclaim.cz/userfiles/file/buzarinurovomilajaloka.pdf
    • https://greenlandpark.com/uploads/files/vibukozeka.pdf
    • http://saovietgroup.com/upload/FCK/file/kugonazolapijokoxirawuv.pdf
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/2531585892.pdf
    • https://www.hkha.org/ckfinder/userfiles/files/girijiwoxa.pdf
    • https://quatcongnghieput.com/uploads/files/jogagewemonezuvagamelovul.pdf
    • http://cleanyachts.it/writable/public/userfiles/file/46853599965.pdf
    • https://stl-log.com/htdocs/cljr/data/files/12219283793.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/lugozapezamekawiwupaguvo.pdf
    • http://houselandia.ru/files/437500037.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/lilad.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/112ba48bed16a885acd0a2ba50163de6/57414530079.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=purana+wala+vidmate+app+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7e5.bin
3ef27faaab1e5241df45cc2a4587a3d21f0e39f2bf1d6a4ebbb7daa6c1659a57
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E5 10636 bytes
font_01_sfnt_off0000d02f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD02F 16792 bytes
font_02_sfnt_off0000e841.bin
a73d882d9fb2dc52122c58fd6d96153072ae03b8cc5ab1830975d91be3f5c38a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 15836 bytes