Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8447d23e9f1a1f2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-20 15:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90323a84154db2d6aec26f3c8d64876e SHA-1: 1f82d8971c30265494807af4a29d20e7d4cd09c8 SHA-256: f8447d23e9f1a1f237aebd16540ff97418acce4aa5b4d7b5c98d8c3b0417499f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple external URLs, indicating a malicious intent to redirect users to potentially harmful content. The 'Password-protected archive lure' heuristic strongly suggests the document is designed to trick users into decrypting a payload, likely by providing a password or further instructions. The presence of embedded JavaScript further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=recuperar+contrase%C3%B1as+wifi+android+sin+root PDF link annotation
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/fowaga.pdfIn PDF document text
    • https://12shio3.com/contents/files/lowajedonoberaz.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/6125213183.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/97178776554.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/2254873475.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/49840828250.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/zewoxupamozijaz.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/88492299018.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/47001653928.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/mazatudixonaxegovu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7bc7d4571---9423334805.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/66406548100.pdfIn PDF document text
    • http://thaide.org/userfiles/file/2092497358.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/dipijufelavax.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexob.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/32241373449.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vezekafu.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/bodapaferegavo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8aa0ea6f2---vebiwowufa.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_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 18356 bytes
SHA-256: 496eba207e7bc6fdfbc6fe1f8089efa2e4f2d07a11827d599ebf401123bc5c6e
font_01_sfnt_off0000fc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 11004 bytes
SHA-256: 60867e07aca538313d0d58269e8b2ca0b011cd1df1df4bba946748fb204031bf
font_02_sfnt_off000115cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1