Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f585ddf0b70e31b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 10:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9084441ea969901f938c252242d1c75 SHA-1: c76cb18d3da96fa5cb3a4b5b70287b9be0a7b6b3 SHA-256: 9f585ddf0b70e31ba8f1138b4e15fe8a2136c4b68299fc9c0b2a342589de9b96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm with numerous distinct hosts, as identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggests an attempt to obscure the final destination and potentially distribute phishing content or malware. No scripts were extracted, but the structure and heuristics point towards exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.agencesramos.com/ckfinder/userfiles/files/vetirupen.pdf In PDF document text
    • http://anhbanglaw.com/userfiles/file/19939688261.pdfIn PDF document text
    • http://beiks.info/public/file/84844232011.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/daparedorafuvojorepenol.pdfIn PDF document text
    • https://seerupit.dk/assens/file/1169528058.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/miwiripimiwedawojefodu.pdfIn PDF document text
    • https://istanajp.net/contents/files/99298859423.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142cdae8aa35---27679865546.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/94411354743.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/6316870419.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/xixubimosis.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/nanufurozuvutaxodegazejin.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/buvede.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/94789073980.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/74816894869.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/10109734799.pdfIn PDF document text
    • https://chilepools.com/contents/files/kakasomulofuxumikiviziza.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/cf5961bf19bdd83dd1df6f68cb86d354/nevomixitoduginumivenu.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/66213657521.pdfIn PDF document text
    • http://104408017.linker.tw/files/25601194796.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fovobunikaruwep.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/xaxuzur.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/14652220843.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/4418226312.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/59018676509.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/16413414876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+power+of+now+free+download+ebookPDF 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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10520 bytes
SHA-256: 5fe5671d1662682c3602a6e4a49fc1143a4b36d7983c647efb346884e61fae5a
font_01_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 17712 bytes
SHA-256: 6887afb519c2597e9bd51a4f3805f943eeff2c84be643b5b2be47d5f47b66809