Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b21ef9457884478…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 19:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3697eb8d4c99600ea1b9733ec33312f SHA-1: 53e2da9be006c41a3f29b2f4a6c8ed60b4f44dd6 SHA-256: 9b21ef94578844787c47c404fd918794e2d6f59e213f699750397ef241ec5bea
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF contains numerous embedded links, many pointing to disposable hosting, and one specifically uses a UTM term suggesting a lure for 'pdf a word free'. These links likely lead to phishing sites or further malware distribution, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=pdf+a+word+free PDF link annotation
    • http://prplus4u.com/ckupload/files/30878620529.pdfIn PDF document text
    • http://indexone.ru/upload/file/najapezajibokefotofuv.pdfIn PDF document text
    • http://shahgrp.com/uploads/26013811442.pdfIn PDF document text
    • http://podarox.ru/public/files/winabemekeleluxedolun.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/73843063027.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/25447920387.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/mogimitamiroda.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/rovetaxuzekiraxakamimamex.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/simapikunuxej.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/73228440499.pdfIn PDF document text
    • http://cl-pub.com/files/files/rumiduvake.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/77249629727.pdfIn PDF document text
    • http://eichler-kammerer.de/funis.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/gobozebutukebinabape.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/64798984671.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/pewanadafa.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/pukinarafij.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/pudawejivelivetujetip.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/popuvuj.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/xuranaximebaboxavubimafug.pdfIn PDF document text
    • https://hiroyoung.com/data/files/nojexisala.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161389b5edc678---vosesozonozaxunanaratavaj.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/zowumosamupolizadukutaz.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_off0000cfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 17648 bytes
SHA-256: bb531c74605930fb29db3831e5a8a11462f2787b3222529744ed76ce7d92003d
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001154e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154E 9928 bytes
SHA-256: aa8cd102b66f5aa302397464867150ee9caeb259ab678b1cbdda191f6318b57f

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