Malicious PDF — malware analysis report

Static analysis result for SHA-256 be24ba1ad533ebd2…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 01:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d14539e4f47313bbee99ea1bc6e0f79c SHA-1: 8be2a71a6b62cc8e7b177a76850664d911922204 SHA-256: be24ba1ad533ebd203cc9987027e2a5426c935dc3511f2c4c445929fae00ff10
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only content and a deceptive call to action to 'enable compatibility mode'. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://mzch.pl/userfiles/file/kekumusivosufatef.pdf In PDF document text
    • http://pokeocncafe.com/uploads/files/86665269871.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/43337614141.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/burasozunamitakag.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/69993377521.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/52286407255.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/79340303092.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/garodexebinisefokozoxita.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/98212918864.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210909084857.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/g435469ps1rvpi4el85mkti6l0/74454444679.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/xurugakinanegavo.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/53480945752.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/gewidegodigadov.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/pijuso.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/kadidogamufid.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/63340751558.pdfIn PDF document text
    • https://mattress-leader.com/media/94701797390.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/barimililegerisex.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/pivilagatobixola.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/tibovunewuwuwax.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/lozekegagojatolixi.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/32450359148.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/780369119.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210914011747.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/wofimakunulifotenuza.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/zenofajameliziram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=enable+compatibility+mode+chromePDF link annotation
    • 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_off0000b58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 10848 bytes
SHA-256: 72f9760a0709dcbabd5fce1bf0ceabfe4f88264985cd12e8eea7a0ffe7ac224b
font_02_sfnt_off0000e633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE633 14364 bytes
SHA-256: 5599867d50bb1f00844d23fdcb0313136ec1716a0bcddffa3159a53b5b9c5194