Malicious PDF — malware analysis report

Static analysis result for SHA-256 87495a4359412155…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 09:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 12729ee649e7a302b6d7900f187d2ba7 SHA-1: d86ea8d118a78fe6954396c52c40d8a611417c93 SHA-256: 87495a4359412155415e2b265f575243e5a7147577c90b1cff2faa16a8aa76c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous external URIs pointing to potentially disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the document structure and embedded URLs strongly indicate a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://srtprogetti.eu/userfiles/files/sizazunis.pdf In PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090516035888.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/50502583270.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/68026533656.pdfIn PDF document text
    • http://sun-tes.ru/files/file/punufetekuwodurodak.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/13024184690.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210908_192149.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/e89fn837brn21kuvq7ii91hjlr/tunikudu.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/paxozemidafedadekokula.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/tutomexefakipolax.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/88463893835.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/nonedilodefoduge.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/tomaz.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/8609752092.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/buvodegomofuwumegira.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161362d4a3ee78---80951446299.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/30770868223.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jemitajenukivetevazavur.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/dojewofunokosipop.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/jewisusawidewad.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210903184956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=best+escape+games+androidPDF 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_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB18 10864 bytes
SHA-256: 5255521c420b0e8465a46851a609d09eccdde63087516b156b9e43841283d633
font_02_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 17320 bytes
SHA-256: b9c6b53e73915bf3e03325d6cbbc88f55097ccebeac9dbbc3d831773d8d8d484