Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be6d53f388ec47d…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 00:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1f52c3c61ad792ec974f37e8a6ba3f2 SHA-1: 5e406198e40f427071fdc6b2719a92b22d2d5d09 SHA-256: 1be6d53f388ec47d004de70bbc87f66041bb77c40293b8cc720977aea26ec91b
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=cracking+the+ap+statistics+exam+pdf PDF link annotation
    • http://a1-automotivegroup.com/upload/files/xadokobuvojogiwuranapod.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/14575345706.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109060649581827.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/melopatadokapo.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/xorulazanexonatesot.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/forawilebu.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109012327228344.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/2194223125.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210921/16321724241838.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4a500c549bb244004d21994dfea0b614/52013639790.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/83318942554.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/tekizogulavamutodepizevot.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/14845069030.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9978c9803---guviw.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/64749069014.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/buxasadaduvefukasa.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/98669884237.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/61551174980.pdfIn PDF document text
    • https://hgb.se/filer/file/fetew.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202193017357420.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/mowawonotumok.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/visulamogurizaxekevepones.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/10738526722.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_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 11124 bytes
SHA-256: 43634de7f249ca99e47c4f8076d80909e82e23eeb8aefb6e424e6514b9cb83b0
font_02_sfnt_off00011969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11969 17600 bytes
SHA-256: 8401b2e69ce8b9b2126e1cbf64f4ed91a1d704cb5c0ab1a05b88fcbd9c3e2141

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