Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfedb3dd87cb250…

MALICIOUS

PDF

75.8 KB Created: 2021-09-12 06:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 621d4a5de1c37a72a18ba241a4fae6dc SHA-1: 0e91019df93b52229a8f1a7ca0292b8a8ee8f516 SHA-256: dcfedb3dd87cb250ddf12e477afbc3022152afd06e2a31002cf0d286f3b2b7de
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, and heuristics indicate it is a link farm designed to lure users into installing browser extensions or updates. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely to download further payloads or engage in phishing. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://perkunasstudio.com/uploads/files/202109031648364947.pdf In PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/91247936294.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/bipelexomavesuz.pdfIn PDF document text
    • http://888chji.com/userfiles/files/27387545875.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/ropunik.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/labasodetogo.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/26971516378.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/xuwazomomikewab.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01c85ee6a---26437861675.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/25338807647.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/724620189.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/29328266170.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/64402257634.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/juremojubodetuzekutukina.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7edc64a86770ec0db889360e514fe1d/pofuzomananekuwubopebideb.pdfIn PDF document text
    • http://benetalent.com/upload/files/fabeziroxijibuvew.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/letokazapobojoxavebul.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/zevibemukot.pdfIn PDF document text
    • http://ciskmv.com/css/file/78484544160.pdfIn PDF document text
    • https://mfdesign.hu/files/file/vibox.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/vumevajujugopuvotif.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///siwinixogowuta.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/jupukosalovakoruja.pdfIn PDF document text
    • http://demkapi.com/resimler/files/67634964629.pdfIn PDF document text
    • https://kopari.hu/files/file/15022376513.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/nizatedodi.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/sudiwo.pdfIn PDF document text
    • https://tuinvandecruys.be/file/lilotufelojiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=clear+the+temporary+cache+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_off0000c6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AA 10420 bytes
SHA-256: 22cbcd1921768b1cb950121c7d938b7f7b8fbdcbc3db312988e16d8a20996db2
font_01_sfnt_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 16508 bytes
SHA-256: aeec77f085a4a37120e3a641b91c76966882af09fc22cb2d1c53c91f1d9d13d8
font_02_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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