Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0184486ea16bce5…

MALICIOUS

PDF

71.4 KB Created: 2021-09-11 05:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9e3454ae5f32fa8343e0a9eebec382c SHA-1: 64f7a43404e9cca3f96beada2c05f174b9a566d4 SHA-256: b0184486ea16bce5ed43791113906060319cfac3abb59b8fd5e0ef59df2089c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://clear-es.net/yamituki-n/uploads/files/50457540246.pdf In PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/52910967785.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136acdd39e8b---41979918767.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/80754486929.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/puzefimevo.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/33249757431.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/72695187713.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/56542024615.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f088938a5b---16674532441.pdfIn PDF document text
    • http://kaies.net/upfiles/file/39827475994.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/xupanolixaliximutadak.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/35205861267.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/69819902378.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/mepojijesebeminomurin.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/regataxoxom.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631212445.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/80205170666.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zinudigusoligiregawapufeb.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/34340820265.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/20251427407.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/40018265838.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/pedemepipe.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/24117574983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=feerfeer+game+onlinePDF 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_off0000b72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72C 10268 bytes
SHA-256: 92d6354dd2069d65df7ade53225c33f0476e403e1fa370e2350a7b1f4a1f098f
font_01_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 16408 bytes
SHA-256: e2db7caf79b82cd5222455e76e0694b55eeea7e0294fddd198b0301928a11855
font_02_sfnt_off0000f85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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