Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adfdbcfaf4661e1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 00:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73deb3680b17109108ae9d3503f6c01a SHA-1: af95706db49dd80bdd7bbffc09c9febd346ecaa7 SHA-256: 7adfdbcfaf4661e178141a4542ff559cfb2cfbfc003a3217abef628f1ef33dd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, embedding a large number of URLs, many of which are on disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=location+privacy+android PDF link annotation
    • http://indyztyle.com/ckfinder/userfiles/files/direwopujawasagu.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/sizagilezejulifimix.pdfIn PDF document text
    • https://doitoutdoorz.com/file/TbhvEW95Xe0kmjUE.pdfIn PDF document text
    • https://rafautama.com/uploads/file/66475219599.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/norade.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161388bd167b5e---29520504504.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210913145929.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/poxivaxupefopepawasem.pdfIn PDF document text
    • http://kalikraft.com/images/file/fikunolofomagaximenoke.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/26828233667.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/20258243092.pdfIn PDF document text
    • https://hotelcorona.ro/files/35744503702.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/risapamebew.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/10270518053.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/50824141022.pdfIn PDF document text
    • http://vyrukrc.lt/userfiles/file/rozoneroku.pdfIn PDF document text
    • https://botroul.be/uploads/26748430040.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/27289988902.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/noladibapej.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f06228ad5e---jofuseronetixivami.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/77941659065.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/30925403615.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210911_E0AF72B177A74743.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/14848880186.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/80134539294.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_off0000b981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 10300 bytes
SHA-256: 3d4216f6798c3d7c96bbb295a7ad494367b80de5c2934a8e0edef7ea13807a78
font_02_sfnt_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 16312 bytes
SHA-256: f6cbc99fb904223aa4843df4666030a09e1445c8cfc535c9e94e0274865094bd

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