Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7251443fe54db9c…

MALICIOUS

PDF

82.2 KB Created: 2021-10-09 02:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 39d5fc832823c71bc6deb389490e4c60 SHA-1: 90e8faf413b41680bcafd5028f94117f08d988ca SHA-256: e7251443fe54db9cd8cab253cae80a956ea63cbc0b4c530d0c13f3e7a28347af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lochoanggia.com/upload/files/44911981053.pdf In PDF document text
    • http://msiutilities.biz/documents/rijenodasotobawajowe.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/jorurifulu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/puwusema.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/xifujigitupepedazo.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/junipewafawamaxerivadalav.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f10544f041---781948088.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/83424595477.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/90624540460.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/83525658830.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/wopebarotokusapesarepesi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4cf1dcef---84717491198.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/43335646881.pdfIn PDF document text
    • https://svltv.in/userfiles/files/56930779722.pdfIn PDF document text
    • http://yipdeals.com/app/webroot/upload/files/23976643354.pdfIn PDF document text
    • http://aquatherm-graz.at/files/bedoj.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/zozovixolumesepu.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/ruvukuvu.pdfIn PDF document text
    • https://cargotavio.ru/files/file/duvipisowutepaluw.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/belixi.pdfIn PDF document text
    • http://coumert.com/images/file/29660259700.pdfIn PDF document text
    • http://headrepublic.pl/images/files/zesebozagawagopujiva.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77600123830.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/tamopifijamoxolugowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=a+cameo+appearancePDF 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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 10112 bytes
SHA-256: acbd6e76734477f2dfbaf6a055f612b7102af14795cf1da162606ca1838b2dac
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 18288 bytes
SHA-256: a3c3f4ec5e9662687917beac0826e7906bff5e2307c9d7edd99af1d75550a639
font_02_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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