Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fc7980f398e1c0…

MALICIOUS

PDF

79.2 KB Created: 2021-10-04 18:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31ab2315a7372bc8b1e33c566c5d9f02 SHA-1: dd3b12ff3e769fde211eac9959ad1783f960b34a SHA-256: a7fc7980f398e1c00bea1762eab7962f11733958673e1d78db370453cd621de6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it's designed to redirect users to potentially harmful content.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=personal+narrative+graphic+organizer+example PDF link annotation
    • http://wangguanhardware.com/userfiles/file/87270771751.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/73459748407.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/14516261822.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/nemuva.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/farm8vgsohtp1gojvdsf28uisp/fevopus.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109221552185237.pdfIn PDF document text
    • https://claudiodituri.it/uploads/nezudokogugojilerini.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/74334342375.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/vexarisuliremogitekot.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/94878278021.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/49469773548.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/dazanojizeweruxij.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/wunevijegojudap.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/72456570332.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/zubiteropinapawoki.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/xepik.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fewikekugevepasolosiv.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/doziniwi.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bexuxejujusi.pdfIn PDF document text
    • https://etimes.mn/uploads/files/14604506484.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/sejuvowito.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/52112657374.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/vopuvinoge.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/3797783464.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_off0000d1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C4 11052 bytes
SHA-256: 611b7540ff610fb5874359ee89745be0aa4263e50b3f4de37f51ce33b6f69d0e
font_01_sfnt_off0000eb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB67 16696 bytes
SHA-256: 7f09e26a3c2fb03bb59ca2968223259f1dd454c84a5e639def4fed24b5f3e674
font_02_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1