Malicious PDF — malware analysis report

Static analysis result for SHA-256 5198f6c935eb5886…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 16:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 098d4fa113ffcc3d46de7fc214b3df7d SHA-1: d3a6a9213344bd11123e4d70012848e2241079e3 SHA-256: 5198f6c935eb58862ab9a516498eade74013a6a04e24ae1c7e81f5d276155cac
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 0.9968

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://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/vuwadozefubuvu.pdf In PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/99178104334.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/58935685008.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/11644568442.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/kakaxarometajowamowavomol.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/85542739755.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wopomonuwawada.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/10116942204.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rdlkgnndccnime9evfl7dtfof6/67372915111.pdfIn PDF document text
    • http://cascad-trans.ru/files/32008222299.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/32808705838.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/sisarakopitufavizuw.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613043f0bf028---96333953381.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/gasikonidawobojagebir.pdfIn PDF document text
    • http://na3.it/misc/file/kesaroj.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/91484780430.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/52485084817.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904115407780364.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/vimubolisamanilinagimet.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/kewesi.pdfIn PDF document text
    • http://consade.com/userfiles/file/14158087199.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/fetaxivitiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=preterite+and+imperfect+worksheet+pdfPDF 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_off0000cd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A2 11016 bytes
SHA-256: 118423271bedfa43f8418471b122f1fffd2ebb0bd078f319555aba25087e4f8f
font_02_sfnt_off0000ff1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1D 18536 bytes
SHA-256: 4846ca176a71768b6382c30ec3835ac25c67ef92000b8947010d29bd0e645c55

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