Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d87d72bb8ce297…

MALICIOUS

PDF

101.2 KB Created: 2021-10-17 12:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9438738e5f8e48c828379b736e2e347e SHA-1: 7d9d3c86d999f3e9ec7ddcd992d5c3f11c6b787f SHA-256: 47d87d72bb8ce297a924d27b01a7ff1a5d0436bb5183c91fb6224c7bde396571
134 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware. The presence of multiple external links and the ML detection strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=metronidazole+for+skin+infection PDF link annotation
    • http://soepcentrale-dekeyser.be/userfiles/file/31741607596.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/winolu.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/82248714115.pdfIn PDF document text
    • https://kristinanamaste.eu/files/leduwotufozim.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/zivalunufenog.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5e21a022f13f3a95c4e118b0670335f1/12336740108.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/zopebemefuniwabowolara.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/93529388865.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/galakivapulujorik.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/gudigumibitidokazefizapa.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20211008_B27D36AE1E11A94E.pdfIn PDF document text
    • http://lejuriste.ru/files/file/96279916157.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/zofaperakedi.pdfIn PDF document text
    • https://primer-spb.ru/files/files/78467242506.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210903_498D6F0988585142.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/tijuvodanidofogem.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/98307995761.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/silotupuwikilik.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1615f4b996f9d7---20003558889.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/sakisa.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/39778133598.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/vikovedujesorowuloj.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///42400889393.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/33938037679.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/meludifikepobaganoto.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_off0001225a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225A 20076 bytes
SHA-256: a21d133e67d0841f45ab94ef95f7378667818c46fa44b4f4f8812253e49d14d7
font_01_sfnt_off00015670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15670 10612 bytes
SHA-256: e9868faf4afcb4d6dfa71184482e2dacf6060a4713bc0c57a7482668c820e803
font_02_sfnt_off00016ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1