Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacf531fadda4868…

MALICIOUS

PDF

85.2 KB Created: 2021-09-10 23:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5c4d63a022e35176bd0df21ddafdd163 SHA-1: 05571d1038535b1073e1e970eccfc9301b2ed405 SHA-256: eacf531fadda4868145e0cf638fe5eca2292f2edb6f07962540f24dd21e30bc6
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 0.9985

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://veganogle.es/uploads/ckfinder/files/55899635390.pdf In PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-08-55-57-37.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/givegazuzalunemaguna.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/mijemuge.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/96440315169.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/56766034157.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/burogesuvobe.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/mukofibowekiramivuvu.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16305860582121883611.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613770008455f---2727259971.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebb9fca394---96575598972.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/20443081940.pdfIn PDF document text
    • http://4rrecycle.com/files/file/4874173767.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/90963936637.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///35283624047.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/92090852667.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jidotusafigogazusures.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/16766915965.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210904235100_cxbnc6.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/wigodavobijurevezitino.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///85323500750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+turn+off+data+for+certain+apps+galaxy+s9PDF 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_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 11356 bytes
SHA-256: f96219e1a0ca2bcc6b878aa2641796ce07f4e6e949442498bd22dc0f97813da3
font_02_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 17824 bytes
SHA-256: a575645f612b3adfe0e954036033f9662459319389e9d7f661b243a039373d42

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