Malicious PDF — malware analysis report

Static analysis result for SHA-256 de84937e9de3b282…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 01:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 90f93f787c732c82bdf45c995a21149e SHA-1: b99e6b42dc4a06c2ff7408ce85e255edc963205b SHA-256: de84937e9de3b282ae02ac7d55d659c4eaabb9a6ef251d1a632654fb569167a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://nomylo.ru/uplcv?utm_term=combustion+of+alcohol+equation PDF link annotation
    • http://bakersfield.thepokeluau.com/uploads/files/gaxijelejivedomapigobivub.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/73527730614.pdfIn PDF document text
    • https://matricula.arendic.cl/files/9563158345.pdfIn PDF document text
    • http://www.celso.org/download/losawiwerekalagepuvu.pdfIn PDF document text
    • http://proxima-design.cz/files/file/fukuxajivodori.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/xutudupunupivibomo.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/lawenematoji.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/wejasebekujepojibojunil.pdfIn PDF document text
    • https://citytrafik.nu/images/file/lolalitumigefixubovola.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/78111771291.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/53707064323.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/tasazoponexela.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/55575536450.pdfIn PDF document text
    • http://guowangcable.com/d/files/83056127318.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/zekudun.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210905_F2F723F92B8AFA90.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/wosinukafazarejazaraxotot.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/64847792077.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e7989c532---91530175595.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/84729849094.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zagawonuradigenojubikukev.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_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 10920 bytes
SHA-256: 3814a940eb742aed3658f09b2e0fdf7368f7bc0728a69bd10a44305788324e9d
font_01_sfnt_off0000fa74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11286 17552 bytes
SHA-256: ecce08c4f8f9ec4142b72ec12efaf0ead6d12576e8f075d792b164f340d84f24

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