Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5d4c92b0eb5e8b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 05:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eb4cb533214d5d0d0fc6ed0e3546c9cc SHA-1: 97e0b5d86c2a5d2de476aadcc808290462cf177a SHA-256: 8d5d4c92b0eb5e8b4485329dfb5376ed8c882f4bcb82641343edf7d123b562ab
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://abwrva.com/uploads/files/70715997188.pdf In PDF document text
    • https://otterdisplay.com/userfiles/file/gutoworosafebakiko.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/78123c73459aac1e3c3dd154b3941ab0/volovuzefajuzaje.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/foxofopefobelu.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/4978688517.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/50179984943.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/73229344867.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/witofopimiradenemo.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/peropuxaguna.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/xekivujugap.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/92494785227.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/85031820601.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/vaselirojawokelixukilu.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/badokavununugepubu.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/wewepomamino.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/gunoliduvovefojidun.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/wofaroniramunibudekuveri.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613497de4412e---72558310247.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/87624096357.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/mebixopug.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/78942518168.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/danudomip.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/37322194404.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/teguruvub.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/xanirigutelisafulipiwuraz.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/pasebikevulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hunting+games+unblockedPDF 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_off0000c1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CD 10936 bytes
SHA-256: b3ec38e440fd2e8d5c975df1cf0e3bae482ddda8094231e3f33f6d8dece0edab
font_01_sfnt_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 16696 bytes
SHA-256: 1226d4a2f95d1d1d4ce0d0d23dc9411731021a346bd0c6355ffcbaa300ae33b8