Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98b072a68e2e135…

MALICIOUS

PDF

95.2 KB Created: 2021-09-09 21:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 7491a4cb458f92918384b1b39a543d0a SHA-1: cbe40f97811a0e0cf68c3d8e7298c859630ca7e4 SHA-256: c98b072a68e2e13538be0fc6e299f202476df85796c5a8d69455a7cf3f605451
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=cool+math+games+unblocked+77 PDF link annotation
    • https://chiuman-hk.com/images/file/46677374239.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/77906406544.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/60616812790.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/97474452430.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/47145297143.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/25182594617.pdfIn PDF document text
    • http://gnox.vn/upload/files/nuxebonefujelawetixuveso.pdfIn PDF document text
    • http://dezis.ru/uploads/files/23258080936.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e6b08b130c7bdef6ed25f724ea551ec4/78022001314.pdfIn PDF document text
    • http://weldingplaza.com/files/file/zifakezosufosareriwu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99ba1809f---xujiv.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/nobunerafusuresoxop.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/tajatoleme.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/peburodozitifeti.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/17847899629.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/99615423490.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/vorizafikosefomevejazajab.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/32744876829.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/toxenumudituxonuf.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/17011593500.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_off00010df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 11036 bytes
SHA-256: 5492a9a1d584519194bf5ce75f46e39b7aa227ecf6211876ecea482107067924
font_01_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 18336 bytes
SHA-256: c0e7d45dbdf3c407551314d041d6a5c4e3fb9c4d16f8b8a639bbd82684f05635
font_02_sfnt_off00015789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.