Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c2efb66736d75e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 13:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1110244238d628f193acd38ff3940c1f SHA-1: 49eef4968f04944966325e37c64abc6124d46ada SHA-256: e5c2efb66736d75e1bb7e11013ddca8163f3d4a95156f739a3a55580edb5df54
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs pointing to disposable domains, consistent with a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the embedded links and the detection signatures suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=how+to+connect+to+wifi+on+android+phone PDF link annotation
    • https://reparationmobile.net/userfiles/file/jojivesutaf.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/74450194732.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/mesedasoseweja.pdfIn PDF document text
    • https://seikai.jp/free_images/files/32825926187.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/60513295208.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/gefuratiz.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/firukavobipopafapetanode.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109120515069115.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/66011783560.pdfIn PDF document text
    • http://sungder.com/upload/44204421343.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/22529585723.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/lofitutomi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/71dd5hem68f68bcutmf499lua2/43013543529.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/30175312509.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210910101318244936102.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/72911000538.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e78e5b63f---55768805388.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/fiwukomovaz.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/84553329166.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/firar.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_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 17780 bytes
SHA-256: 746623299d8e6e197c8764fdf0fc5de963a1b9059a00708881b48a619cec94af
font_02_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 10580 bytes
SHA-256: a087a757d0081538ee0b7aa76af107a36009e143affdb3c2d30371c0e36e8b77

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