Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5d1ca079ac0e97…

MALICIOUS

PDF

85.3 KB Created: 2021-09-21 04:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4cc9cda39bf534f457ae685645ab6fd1 SHA-1: 4d6645b39ff63814a649466882e79ef8de6575f3 SHA-256: da5d1ca079ac0e97e0c28d4b95e5e87bd6e07879d57b2ec302c0b2867c52e978
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=david+copperfield+chapter+2+questions+and+answers PDF link annotation
    • http://otevrel.eu/ckfinder/userfiles/files/45890691354.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/37737453111.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/xagaxidu.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/31192675964.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/40184544941.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/72027701046.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/todevipu.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/98164105626.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/4191729886.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/67576371421.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/35308760464.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/25259316214.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/59955804513.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12306491607.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/46842982332.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146050a1c3fe---97394632678.pdfIn PDF document text
    • http://attlas.center/userfiles/file/76506392286.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/21061883600.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/22922497505.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/27530562346.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/lokasi.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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 17872 bytes
SHA-256: d605d38cc4cebc91419a399523c061d4ac7ee67b57cada91e91288d3f7c3be91
font_02_sfnt_off00012d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1C 11236 bytes
SHA-256: f2663a67d996145fc3a86369abd83c55cb2fd4a98afaa98220d194c8f3d167c8

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