Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28445a1c9bf0110…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 19:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 658a6cf168b9489387925459aaa21273 SHA-1: f7546a5cd402e4ece3f38ab9f1c7ec0f36903ee1 SHA-256: c28445a1c9bf011089abf78ac3b327b905f0793d56ac97011f6f6e940eec87eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution scheme. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=speaking+vocabulary+for+ielts+pdf PDF link annotation
    • http://inter-travel.hu/_user/file/zupegaketuruzorofemus.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/tovadamatamazekesuxaw.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/32280363693.pdfIn PDF document text
    • https://kaisar168.com/contents/files/37525610143.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/josidamixajovelosawekiju.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/63116689199.pdfIn PDF document text
    • https://senegal4d.com/contents/files/rupupene.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/14704365426.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352a6a28bfd---wovikijotijapizuxawekazep.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/77268737247.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/86677626376.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/luzajuretafakukalasifob.pdfIn PDF document text
    • https://castel.ro/userfiles/file/jaxizigesatapogolebu.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/jonototukujiz.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/fabufaderit.pdfIn PDF document text
    • https://jagominum.com/contents/files/69977794834.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/46533360547.pdfIn PDF document text
    • https://duvanco.be/docs/files/zijibofenazoxixesojelufu.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/94541307505.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/sakuwavuforasugesuso.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/17807050307.pdfIn PDF document text
    • https://sealskinz.ru/files/file/tasozaso.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/wewejulugin.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/51442776114.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_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 11384 bytes
SHA-256: 28ef0631a1487ab42ae656c14d89e854fa229e26b41caa5ae4e84aef574959b5
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 17652 bytes
SHA-256: d2e5e2ee525719a1fe996721cb549f5ada2165f058bb2f71863276654712597f

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