Malicious PDF — malware analysis report

Static analysis result for SHA-256 49da929b24742a1a…

MALICIOUS

PDF

70.1 KB Created: 2021-09-10 23:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6e6190f6d53392000be0f21b70234673 SHA-1: 581609819a16204c8bf018bc2df78eb3eaab0594 SHA-256: 49da929b24742a1ab0febf4b5ec7b394b4ee3df8bfc4542a229911f5faca6860
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also includes multiple external URIs, one of which points to a domain associated with a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://khocabien.com/uploads/files/volonuwaposawijatosi.pdf In PDF document text
    • http://dioceseofniranam.org/userfiles/file/1751359440.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/1728289168.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/supuzaviwanap.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/vidinidixenufidoxufagega.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/vewotese.pdfIn PDF document text
    • http://cortabellanews.com/userimages/24725132000.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/80590333258.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/25310349319.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/66317602406.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/23926728185.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/37149945968.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/88203010111.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/90322768395.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/1357750525.pdfIn PDF document text
    • http://jarosi.hu/files/file/50244746295.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/mibapufedatonabizeriletus.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/44693853151.pdfIn PDF document text
    • https://membermimpi.com/contents/files/97189039459.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/nasuvas.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/murejomukesulo.pdfIn PDF document text
    • http://epicridesnepal.com/files/xanizafozutexapenakefodu.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109040102021380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+download+sex+gamesPDF 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_off0000b492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB492 10664 bytes
SHA-256: eed91c16d7debc0cebe87291b2a6b13cb2e60ebd332bbe90edcdb167ebbe7ef6
font_01_sfnt_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 14976 bytes
SHA-256: 19dba3983cb07c9b4ffbb7e69e6e5d81b0a5120bf1df5a92d454a3d701056498

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