Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0b6bb6e1f45a3b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-29 07:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f9c008d7545d691a02643601a97bf2d SHA-1: 808e5a078471a0a9b08a2b67ef5a5210708a62b5 SHA-256: 9d0b6bb6e1f45a3b84fbb3bc4385d57c2d2c42c9c53e2d08a45940da7a473d50
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tavio.su/files/file/83408344646.pdf In PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/99975086291.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/35831979158.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613543d30ab04---67248830262.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/82484395675.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/69481005387.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/vajorevafodul.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/rexutazaboto.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/begamifu.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/83583708070.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/butunigoroziluvu.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/seranilaruxa.pdfIn PDF document text
    • http://rcot.by/pics/files/zilerasavivovesubawitada.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/gijepedonas.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/nevifilivam.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/89888595127.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614472eacc105---67015516715.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/1600062485.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/pofititakal.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/39508244414.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/puredabovinisori.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/99711729472.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/vupedexebuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=newcastle+united+wallpaper+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_off0000b88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A2 10668 bytes
SHA-256: 7a365c082498df5ab19bd6de07b71ac3618575286ebb01afa262b4ffc959239d
font_02_sfnt_off0000e93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93C 18120 bytes
SHA-256: 98e0aad06332396e7f9665dcb05c8129a94568b56051db5b05879ac6d3836ebb