Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf7b866c1c8d74f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-26 13:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fadb37522697dc9789cc42e334105684 SHA-1: f05e28d846152043bc3e7dd4d09e1ff07b968609 SHA-256: 3cf7b866c1c8d74ff82345888c34f03f5200a846d093c0a9ff04f35230e5647b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs, despite some being marked benign, point towards a strategy of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://techinnsrl.com/writable/public/userfiles/file/90371739036.pdf In PDF document text
    • http://telegid.tv/userfiles/file/84474406106.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/20578123029.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/79767092296.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/21496088823.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/saxepafevotobazoxipezema.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145aa5782dcf---29803593682.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/64149310798.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/62652913942.pdfIn PDF document text
    • http://profstil.az/userfiles/file/92910175091.pdfIn PDF document text
    • https://jagominum.com/contents/files/62945409652.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/89452287603.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/68195071458.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pimadusuxitenurisija.pdfIn PDF document text
    • http://contua.org/userfiles/file/sarikuzevenaxu.pdfIn PDF document text
    • http://mosjob.ru/images/file/tivopapuvufikevenujikug.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/11993434221.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/resuvogurejef.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/lojufenefisajibiladubem.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6a605f46d7fd5e541e033c909680b72c/jinonawakogilun.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xexikenatazilexofaxaje.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/61997671330.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/zowape.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/81478310291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=vlc+m3u+androidPDF 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_off0000ca17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA17 22652 bytes
SHA-256: bdcbe5550e30c59060cd011e8a70b6a6c9165178d79def35e125882a58bde85a
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 10376 bytes
SHA-256: bb6d1f2960faa735510c245b458fc05d0411e871af52fed28f5c6d20cacec49c
font_02_sfnt_off00011aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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