Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3dfb09fb79cd23…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 21:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f8330444c5719d7cc6fa0a801cfd4e7 SHA-1: 4a263a7fa5a867ad28a22c0a984e1d03002c6aad SHA-256: 2b3dfb09fb79cd23b645bc96a2435aeb0ffb6882cad0e24c10beb3fd5fa0dc11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=word+starting+with+m+meaning+beautiful PDF link annotation
    • https://mklaassen.nl/images/file/63646142826.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/79936597359.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/bejububidevisotawawesalo.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/sabinemupadevivi.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/36998939837.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090510182230.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/41631648507.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/zimife.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/pebexiligazos.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/wokevoxiworulimemu.pdfIn PDF document text
    • http://apsons.eu/files/file/lojemevomizivuji.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/sopanurutenigobus.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/20966529665.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/masutenasixusijadiduwusi.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/mojowivosibirimar.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/99581852350.pdfIn PDF document text
    • http://newshop.jp/archive/file/93887748883.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d96b0f1e75b997cdc0470b131b766360/21861251410.pdfIn PDF document text
    • https://shibbirs.com/media/files/58907225754.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/7351152510.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sosajobelanojamugem.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/gajubegerikaxuzu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9201e229f---95491546351.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/kuxoretudufit.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/61941938200.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_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 17392 bytes
SHA-256: 9fa073988fa76f1d6966cd1b4527bfeb88d0bffb43a80b5f597745e7a1a8e9be
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 11120 bytes
SHA-256: 316ae47b20d8f383102865205169da225ee17659596ea9d4a1e6bb502149e858
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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