Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd3e8a729b29ffa…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 12:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d6d6e987f8d05227721f7b1af23a31e1 SHA-1: b5f4ad86786a066b6f866fe2ea0bca674921b154 SHA-256: 3fd3e8a729b29ffa9035fc1def009430f1780f7a639c568e293d974e6e0a75cd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV and ML classifiers identify it as malicious, likely phishing-related. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://reklamavysocina.cz/UserFiles/File/30643795375.pdf In PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/dotuxopofonexuxetelujagud.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/raregenin.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/sajukava.pdfIn PDF document text
    • http://domexpo.ru/up/file/61193741608.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/24775113997.pdfIn PDF document text
    • http://short-story.ru/upload/file/92791320964.pdfIn PDF document text
    • http://spbi.cz/res/file/45511424575.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0d6ff76fa49338e5a93a86191c8d43dd/tamuvijojefubada.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/40753519934.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/nuseriwadir.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471c9242138---67651666739.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/sovasibi.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210904_184549.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/42209595670.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/gonexavadolivipageg.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/fisonegifeduxep.pdfIn PDF document text
    • http://envigest.cz/upload/file/16688445362.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/lafek.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/58523653935.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/gosoreferowexofakilerun.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/45561276001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=name+ringtone+editorPDF 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_off0000abe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE2 10352 bytes
SHA-256: e7419a6f2de3618ab0fe11f4435dbc0d924531d89df06eedc0d7faef6fec839f
font_01_sfnt_off0000c2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB11 15352 bytes
SHA-256: cdc79fc1184d525cd52ec69960d8de681f9d5471c4149913eb20efe43ccb2776

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