Malicious PDF — malware analysis report

Static analysis result for SHA-256 81095c24475abc74…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 15:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d282c110e90bf53bb34c304879808ae SHA-1: aefbd88e2a96365b4081ef9746afcb46ef6d3255 SHA-256: 81095c24475abc74a4aeeb648a5c8376aed4d56b1b4e06ce7ae57a67176e5018
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, with heuristics flagging it as a link farm on disposable hosting. The PDF structure and embedded content suggest an attempt to direct users to potentially malicious or phishing-related websites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=best+bollywood+movies+2017+to+2020 PDF link annotation
    • http://crm333.com/documentos/file/38076967005.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/42827618340.pdfIn PDF document text
    • http://anindecor.pl/files/file/94750735917.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/midumuni.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/31725566857.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/xumumexebiwo.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/wunevokasowebomawojemesaw.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1632143765_1.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/besalisi.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/61056846584.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/sebav.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/zojogevuvuxozome.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/60130682759.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135acf3271bd---jibusuvugewatofoxe.pdfIn PDF document text
    • http://synphabase.ch/upload/file/wolegizik.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/95301389255.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/loziwenakur.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/34982944412.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d92e8a82f---3415056685.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/47329699985.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/1703122930.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/78417180851.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/10352648970.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/19992998241.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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 10844 bytes
SHA-256: 93d5b66be2b3d89766964386c91297b862bbc567f6455ff859eba538399b5657
font_01_sfnt_off0000c839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 15728 bytes
SHA-256: 396d6cb6834447caf38f365918e485a969d27cb05e3506080968ef3b5e0b1dd4