Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4f7cb7e94175bf…

MALICIOUS

PDF

82.2 KB Created: 2021-10-13 05:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07d904c4de7045f4cc0961b8c8bc2eb5 SHA-1: 1a053a66811ec5cc9143937f59ef9c75e36a2aa5 SHA-256: da4f7cb7e94175bf6f39336d87431e79a8177a05124d5181d78b8e21710c100b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs extracted. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://taxfreepoint.com/file/xefiseligibunurufi.pdf In PDF document text
    • https://autosaloncenter.com/uploads/files/1543957630.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/fidorujatemilamutozixata.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4a5d6c1b---10938436140.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161489cd8cb1ee---fasunoviwixowujotefixede.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///47746390844.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/1948141956.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/6960592383.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/bowovomolus.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/dipemo.pdfIn PDF document text
    • https://bdata.vn/upload/files/27636292304.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/52477841609.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/40451434347.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/fuxirefuzivol.pdfIn PDF document text
    • http://clickvay.com/upload/files/77837758237.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/faxefarosidaset.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/foponotebepoguvaguxak.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210904_465197C517F1C0CC.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/juraruwun.pdfIn PDF document text
    • http://vswet.ru/f/23882492919.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/luwoni.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/sizovagifimaxesudud.pdfIn PDF document text
    • https://ipmgrouphr.com/uploads/news_file/muxemesefivesasavekumoxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/u-9XGpgKpwY/uplcv?utm_term=caffeine+and+hungerPDF 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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 10332 bytes
SHA-256: 241b2ebed52d2ddc78d6253421f79d93a21f7004f7b4339564fbd9f9599b242a
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 18464 bytes
SHA-256: 0d3685a429ea03c36097b8544db9fd29c78b271e0a918f4b8db587c8cedc9cd6
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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