Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d530afeedb172ef…

MALICIOUS

PDF

87.5 KB Created: 2021-09-17 02:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acc8ff2dc8c295ec26e812bdecac1a5b SHA-1: 160d7c2158907e6cdfebcdc6684a73ddbea31182 SHA-256: 6d530afeedb172efcb8b2b4bc2df6431cb847f93e31dc0c5e1f66d314825b996
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 4

  • 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://vespaclubcagliari.com/userfiles/file/99767328663.pdf In PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tebod.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/47086326941.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/84000556911.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/nelasaripamedam.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zikezo.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/warigar.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/bejufovomozexama.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/76348137502.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/79010426896.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/68646044720.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/sebegifovadusedu.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/36551879335.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090403194319662.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/buzusotoromu.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/50947412925.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/33580743008.pdfIn PDF document text
    • http://wajl.net/img/file/202198194237.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70934728814.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/lamojenaf.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/vopijevekiwewa.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/57306681318.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130296791728---5612524999.pdfIn PDF document text
    • http://accesoriosalmayor.com/images/userfiles/file/nafeguzimudu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161324b5fad518---81500861691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=graphql+in+androidPDF 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_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10276 bytes
SHA-256: 462f603b571a8f98467785ec6fcedb65d1853216ae10cb51daf59b175384a7ee
font_02_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 19692 bytes
SHA-256: ba338721ac984b231bc5adce71e1410e3b4c2a92deedf5e306fc62e9935c18b3

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