Malicious PDF — malware analysis report

Static analysis result for SHA-256 beee6649687f9fd5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 01:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f864cab4f4fe5ae3aac220fee67cfff8 SHA-1: 0fd2bd17a009301e9af15e693715fe3dbf79855f SHA-256: beee6649687f9fd5141f54d4016ed94daba32332afafdd7d15e2dccc295f8773
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a tactic often used for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=ldplayer+download+2020
    • https://ildiko-szepsegszalon.hu/userfiles/file/kosibapov.pdf
    • http://mrs-edu.com/sribati/editor/uploadfiles/kezitemixakubexamewemuk.pdf
    • http://seksdagen.nl/userfiles/file/63398380539.pdf
    • http://popnmusic.fr/userfiles/file/nomugetikom.pdf
    • https://escolaalfa.com/userfiles/file/majumifudakofotukopunul.pdf
    • https://manuscripthandler.com/userfiles/file/xuzibuga.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/nizuziwiwokefiwa.pdf
    • https://wemservice.com/ckfinder/userfiles/files/zinatase.pdf
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/22898682357.pdf
    • http://pp-aqua.com/userfiles/files/rivikabarubomopivirifapir.pdf
    • http://deurenhanger.nl/userfiles/file/xezosobufabino.pdf
    • http://itcbeautytrainingschool.com/userfiles/file/49316242853.pdf
    • http://swaminarayangm.org/userfiles/file/1525719259.pdf
    • http://hamdannepal.com/userfiles/file/kavotojazepuje.pdf
    • http://oawebserver.com/piceditor/file/36003222802.pdf
    • http://www.fonfe.com/uploads/files/66457930598.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/buzexutexitebegajajud.pdf
    • http://eunlocker.com/Images/Editor/file/patigadafuvesukuvafijegif.pdf
    • http://ddservice-bmw.pl/userfiles/file/foxiwajaxinojokalilazeful.pdf
    • https://taperagi.com/contents/files/rogifasobusow.pdf
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/88507922358.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/83476860021.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/83251471694.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140eec54a592---57075671197.pdf
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/67752393096.pdf
    • 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_off0000d40d.bin
3b01e18ce14f73488b16d75f3d2cf30b929ae5a7dd0d4f8d4af0174dc407c384		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 18508 bytes
font_01_sfnt_off000104d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 16792 bytes
font_02_sfnt_off00011ce9.bin
28b1130e94329def2caa66df31a83211978a4fea0840942474adf6609e6064a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 10424 bytes

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