Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a743bb519a33e7…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 20:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cede625de3f10df766173840d7da35a7 SHA-1: f443a58769776da4e48776b2012439bb1d97b19b SHA-256: 75a743bb519a33e7db0bcc298f0a2156453804b68b1e2d399f45f4ff89ce043d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to manipulate search engine results or direct users to a large number of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5974

Heuristics 4

  • 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
  • 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 http://jfe.hk/userfiles/gujoxetuwuxumil.pdf In PDF document text
    • http://szwygs.com/upload/fukozekadosetisafirano.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/somejuxem.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/wikifofilibibena.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/pumudupedozuxosapi.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/64730760898.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xujalegotogetu.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/48427209038.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613534f0ba54f---bogowikevog.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090712550279.pdfIn PDF document text
    • http://yjccnc.com/upload/files/58176595165.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/130264612.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/31803879155.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bdb1848fe61a73757ffa232a9de661e5/xadutavuxin.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/xurixumerek.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/pigogujemaw.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/debowedajejuzuwunibu.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/49780175022.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/67004350200.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/jimagodijudubepewu.pdfIn PDF document text
    • http://kelvista.lt/images/files/34486748500.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/wapemame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=abpv+app+reviewsPDF link annotation
    • 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_off0000de3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3A 18568 bytes
SHA-256: 81b9a78b2f9e77a346303d3872d0d2da6808a3433aa4b4042252a9d23a440f17
font_01_sfnt_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 10152 bytes
SHA-256: 750ec2e84c40be4a49c9445b172eb75a1516afaaaa2d4e96a40aa8c05c44e8c4
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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