Malicious PDF — malware analysis report

Static analysis result for SHA-256 2def5d990c38f3dd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 14:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2aead85de50bb5dab1a5dcdd977a285f SHA-1: e5c9b78a5bd949a833547d1f0312bf882c7d97b6 SHA-256: 2def5d990c38f3ddf78e6e346c3020656e18e7ccce57a1964e3336f32d370863
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of numerous external links, many pointing to potentially disposable domains, suggests an attempt to redirect users to malicious sites or download further payloads. The heuristic 'SE_CALLBACK_LURE' indicates the document may also be designed as a callback phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://top-caster.com/userfiles/file/jobatexiganubuwimojalev.pdf In PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/vefewigax.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/suvebusavil.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/4720043480.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/77891937523.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/gujuwaleguwurapoxopam.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/82540057636.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/liwusuju.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/pizajarogimasotigajevu.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/56457110349.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/95679076582.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/83028001164.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/pijenagolumusorawide.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109050433041144.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/27560577492.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a06926e6cf---73263062300.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/82081608985.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/84777946356.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/89112845418.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/lufiwosilefile.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/695904995.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613af4425d3f3---88165723148.pdfIn PDF document text
    • http://japhina.com/upload/file/zajolukoligefedimuravet.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/mibesiliganilegusip.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/77757926020.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/91444202126.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/punir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+tv+apk+downloadPDF 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_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 10436 bytes
SHA-256: 5bee1e89f4cb7bae0526c182909f732d95c4effbd12e70d1bae246a529194063
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 17824 bytes
SHA-256: 615e368499f979c353403fca3032d2366bed6fd1e0f5dfb4ddff9759ef6c69a9
font_02_sfnt_off00012300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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