Malicious PDF — malware analysis report

Static analysis result for SHA-256 de965183e8486c6e…

MALICIOUS

PDF

87.7 KB Created: 2021-10-11 20:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f53ff0c8aca69106ab7e74dbea22c64 SHA-1: 5932d24cb056cf78ccad36547f5d132cd269236a SHA-256: de965183e8486c6e3738ff69f7d08edc41f95c0d69be85dd92f099fe7ced6f12
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://rafaelokazakov.com/file/bujojunalurot.pdf In PDF document text
    • http://antonioruizabogados.es/userfiles/file/29258903050.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/16719803139.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/31603726130.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/52921994230.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/54218017513.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/17204038849.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/vulisuw.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/46025076901.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/xatele.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/24pvbi4574hifsslla8fubh5i4/87389673568.pdfIn PDF document text
    • http://haki.vn/uploads/files/15781975743.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/83245703951.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/kanofekid.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/nefepagufukuzebokebuvet.pdfIn PDF document text
    • https://reniuved.it/file/34106635463.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/4876051002.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/55095878851.pdfIn PDF document text
    • https://sledovani3.gpshlidac.cz/www/userfiles/files/moxamepafadexulam.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/74929411897.pdfIn PDF document text
    • http://citlak.com/admin/UserFiles/file/28090241719.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/xibegowobibobonise.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/tanotisubumapezibi.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/21549722363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BcFPVxLj4jw/uplcv?utm_term=door+supervisor+exam+questions+and+answersPDF 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_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 11008 bytes
SHA-256: 37a953053afefb86d119954e36322cde1c446740057e0acc87d8be0a81740e88
font_01_sfnt_off000109db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 18208 bytes
SHA-256: bdb543d620945b162796f45ba88296ad1227fd956bc15535649bd9552eb8e7a9

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