Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3fbada9d5a5a78…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 08:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c73b925181bf4a7ac2a84fcccb5a595b SHA-1: cc81ff2f4184570bfa5fd1525e5dac57e7138812 SHA-256: dc3fbada9d5a5a78734cb1c5666a35b19030682bb1b2ee808e521c907efed468
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bedandbreakfastholten.nl/userfiles/file/pakumudazudefuzipagimutop.pdf In PDF document text
    • http://mariopresto.pl/userfiles/file/kodunifebupe.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/bakupepalofe.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/56919596159.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/49173228624.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/fupum.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/bafexefakewomasaxuroz.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/98021358575.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/latizijasesagumubudovub.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/975d71332ff7e922f14e243809a9b277/48843846775.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/40891745260.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/98486479590.pdfIn PDF document text
    • http://baoveantam.info/upload/files/figujovapuluvitotavi.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/74841309042.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/49098466064.pdfIn PDF document text
    • http://henca.com/files/details/file/ladodofifuxopiluki.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/25226259575.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/nepekupek.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/fonogusetosokow.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/50462558344.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/fibaguripig.pdfIn PDF document text
    • https://ccskin.com/geektic/files/83259370831.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/26233359866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=locate+android+phone+using+imeiPDF link annotation
    • https://mediaget.com/userfiles/files/degilidumo.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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 16596 bytes
SHA-256: a7a6e0503069e61fb88ad2ad8d12e66c0e80676fd770a5153eb6ba1428642084
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 10972 bytes
SHA-256: 2631393974a26e1fdf56d8d28fb8aa17328f9886affcf2a059de8d7c110e4849
font_02_sfnt_off00011a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1