Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7eec692375c9ef2…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 19:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ba7f9c4a78d56121da9e1ac7d491ac67 SHA-1: deb9a9c8c6873021370005662f95b11e55640687 SHA-256: f7eec692375c9ef269a15e7c83baf86da6a703f752103b59744c3ea55a99b28f
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, suggesting a phishing or redirection scheme. The presence of multiple disposable links and a link farm heuristic further supports this assessment, indicating an attempt to obscure the ultimate destination or distribute malicious content across many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://wingmanresearch.com/userfiles/files/xuvagejajagubowol.pdf In PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/fofizenagusub.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/66904805982.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b63fe2d14d---debozovegebuk.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/11189558350.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/jomevizotabefupibizawe.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/jipewobife.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/72920977292.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/futalawo.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/wugerem.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/xoxupatavawovavetupinen.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/96879656179.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/ganadefofoxusaxo.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/96723227950.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/fagugulilot.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd08bc4efb---gemav.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/16916765783.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/68633008035.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/70547244905.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/zobeza.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/gunisematezap.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/56325194515.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/jupadidipoluxosikisuwegi.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/21911545531.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109032019426478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=attack+on+titan+part+2+full+movie+download+mp4PDF 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_off0000c9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 17688 bytes
SHA-256: bd56098dfde4f217b3cfbd2eb9cdb90b9127b622b728a34e2ca5dddd7fbaf82e
font_02_sfnt_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 11136 bytes
SHA-256: 36deaad1b1b7c7db521a5509c817731e391f93fca7a2bb5877595e4feb01fe15