Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42e5663781cf8d0…

MALICIOUS

PDF

74.6 KB Created: 2021-10-10 10:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ef5a17f57a4e070b13db4d48f48e0b03 SHA-1: 1e081a480b1b2e677044dbf682d86f776bfe04fc SHA-256: f42e5663781cf8d0e209700daf52919a34407f3d54e756bde4419f62cfdb2f05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to distribute malicious content. The PDF structure and embedded URIs are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=longhorn+gold+and+silver+exchange PDF link annotation
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/15968477585.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/3914544432.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/51823337711.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1952065ba503523bfcda6f40813bffe/suwedewokegukon.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vudovuli.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/kizisusofeg.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/96835553056.pdfIn PDF document text
    • https://salwangurugram.com/files/5528891994.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/82075988061.pdfIn PDF document text
    • http://cmtsport.com/pliki/fuxepumavaranimor.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/12673978927.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/narom.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/66656536978.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/34184080104.pdfIn PDF document text
    • https://melz-feu.ru/upload/dorukijelozogipikamuv.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613df483924f4---98638119134.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/sunelimagatepuzeruvoganam.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/20977730688.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/murerurupedezes.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/movolilo.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/pajogoputirulikukuvi.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109132232201511.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_off0000bee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE0 17664 bytes
SHA-256: 4bcae1cbb805c26e48991eb426021a8857b3eee7a075d9b882288b69cbe4efcd
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 10676 bytes
SHA-256: 978a18904aee7ca14f955a81169ac24fc3864491c3e9a8a971c3c784a9a7fe17
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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