Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f40b73345a122f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 13:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 411181b5081bf43b08879a0f13620c70 SHA-1: db9932ab3773ce7575df3f8f37d3519030ebb039 SHA-256: b9f40b73345a122fbe7267b914cc64b64ac6f6521c952732e556caa761340eea
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or link farms. A critical heuristic identified a 'Clipboard command execution lure,' indicating the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. The presence of these elements strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://drafthe.ru/uplcv?utm_term=install+android+os+on+raspberry+pi PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16135b40194c32---pewosatarolakutu.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/sasuxefunatakufajasemub.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78424c365---47678199124.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/xamuromawasodamo.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/wenonovokemera.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/fepanutevuvasejedapa.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///muludif.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/34625433184.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8hocus2iihvjj1c7925dqe6jkd/xirizeragu.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/sadovudegilabif.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/2055333045.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/37278738701.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/52753780295.pdfIn PDF document text
    • http://bakoca.hu/files/file/doralebew.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210910110047.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210910140815_sga7fz.pdfIn PDF document text
    • http://sentai.cc/data/file/20210908_022941_792.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/51258571798.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/dironuvomo.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/72581422678.pdfIn PDF document text
    • http://poliinc.com/upload/files/pezobejapekodum.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/53281029253.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/dixeladojoxur.pdfIn PDF document text
    • http://asesoriagade.com/app/webroot/files/files/31754321869.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/dubuxurubitu.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/lufejigotokabij.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_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 10592 bytes
SHA-256: 4490d8ff5f00f74cba7c8f41d73b3dcb4e995b9e1fa6d327cdad406944e75b6c
font_01_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 17268 bytes
SHA-256: 685dda00e52a9900ab820b79c86bffd9d1d2ae92350cff447c089874a9af9997