Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e53a41fdf3dc9c3…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 07:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5b06c4f14b72e1c42e8ded3053e9b8ba SHA-1: c05e56a6e4a82887a85b8f464dea97f9c9fd3927 SHA-256: 2e53a41fdf3dc9c32d865f0874364a5c4871745692639d8f5cd10beebd0b4c81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://optikametuje.cz/userfiles/file/nawoxuruwerivasi.pdf In PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/85085766319.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/kikuf.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/pivedan.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/wetoje.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/42389922920.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613870329b01b---tenetulirapewipumokabizit.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gokeru.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/xapadubepu.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/22834031555.pdfIn PDF document text
    • https://aaaxxion.info/images/file/94045432383.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/64638855449.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/11732652008.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/94884528424.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/xotiwunosezinaru.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/rivatit.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/bajefusixodugobizil.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/zedekaxivepuvizizudo.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/zoxadunonupodufanakuwiki.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/lazotuwegi.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/fusubibabawitovago.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/kezeru.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wuxarafoliganiraluzote.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/69866d3a6afcdd6dac47016811913507/87059655717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=autocad+plant+3d+2019+tutorial+pdfPDF link annotation
    • 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_off0000b628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3A 17028 bytes
SHA-256: 3fa5f40e807486d41766d3ceec510e5e54cfb5686e85e0544e78d1bf43b81e91
font_02_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 11028 bytes
SHA-256: cba3a8d5d4fa64d30d91d49fa434205811989398cba5c6ee308d178382a2f92b

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