Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad8b5c323c5aee9…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 00:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4462e6fdaae4370459b858c9b468eb2 SHA-1: b2cfcc7089d38250bf11b5ff2538a490308a04da SHA-256: 1ad8b5c323c5aee986fced12f42cdeac2b4165f789ff0a3f1e42261b936ab132
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which are structured as link farms. Heuristics indicate it's a QR code lure, instructing users to scan it with a phone, a common tactic for phishing or malware delivery. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ketchas.ru/uplcv?utm_term=iphone+qr+camera PDF link annotation
    • https://balmbeach.hometeamcorp.com/images/usr/kulakemuf.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/22117921897.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/zolokuzekedewekonob.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109230924217879.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/95347071191.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161525f3fc5ffb---9138997730.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/60786273878.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/kewalom.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/sisutidabi.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/xaxuvotidegeledepusizup.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/63850548347.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/64814541394.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/patukoborukegakekevev.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/33759605312.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/65210028487.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/lepamavidujomemiridurawaj.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/tavimukagaruxizetuned.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/40042070761.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/11821720350.pdfIn PDF document text
    • https://purefeeling8.com/data/file/6832669486.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/patiwe.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/36043230617.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/vumepogatenesasiziso.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/47431093971.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/31939742595.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_off0000b3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 16344 bytes
SHA-256: 66abd9f2c129c44acbf36262e9059bc8968660a61f94795e162c64d6d2de3ea8
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10332 bytes
SHA-256: 997db4cb3ab338609d0a8d1f12b66359391132f46125e9dc5abaf3fc17c0a5fd

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