Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c39b21e90750b78…

MALICIOUS

PDF

83.4 KB Created: 2021-10-08 22:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 547c19d77ed02089554b1933e0554ab8 SHA-1: a8e0cde8f7ea702625c1c2262b4f024b8d259139 SHA-256: 6c39b21e90750b78d464edfe57ed91d3c23f72c385504bc439e40fc9173111b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a phone number. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://garglob.ru/uplcv?utm_term=call+of+duty+mobile+hacked PDF link annotation
    • http://wabasnb.com/files/fckeditor/file/20113189006145617b11b01.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/pexanovodipigukawuwama.pdfIn PDF document text
    • http://zuche0551.com/upload/file/49926031571.pdfIn PDF document text
    • http://knipia.com/userfiles/file/67252739923.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/62181677466.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/nodekakogo.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/103555303561422063a1c46.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/wisixatepuzipazovemaperot.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/96825052415.pdfIn PDF document text
    • https://cartolmania.it/file/44920845811.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/45109475559.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/rudisebapanefejap.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/kegubiloko.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea10fbc320---fivuladorojinobigofijo.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/nivadotijumarux.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/6466807796.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/34084392560.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/76590278398.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/19977218879.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/sixetakanexilusevojovawaj.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/82632173339.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/1691298688.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/11194859214.pdfIn PDF document text
    • https://arhiapp.web-idea.ro/app/webroot/files/userfiles/files/9554442791.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/jerilezubep.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_off0000ddf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF6 18536 bytes
SHA-256: 5c3cc7cefa42961d8fee6fba5e99af8f9878f3d666eff7e3083c1b6eecaf59c8
font_01_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 10848 bytes
SHA-256: 3e386c6ac03fe69fefa8b6a3723328f6b6a288ca2c14032c6de65ba2f226f60a
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1