Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e69cdf6f655557…

MALICIOUS

PDF

83.9 KB Created: 2021-10-08 13:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a249b81f2a7c910e6dbbea398f0d83c5 SHA-1: 443b2e0cc8cf7c404b01dc89bb29ab77219dddae SHA-256: b8e69cdf6f655557ab576568c4310b35f0df1f4f99f69a0bb4a2c5725f2f031b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various domains, many of which are likely disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://drafthe.ru/uplcv?utm_term=perfect+cube+root+chart PDF link annotation
    • http://alompar.hu/uploads/content_files/files/lafamozurizum.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/96034649179.pdfIn PDF document text
    • http://stl-hk.net/userfiles/68123752864.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/xadimuxida.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/zerilitikusuwesukub.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/57066965736.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/75748635683.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/vidofadumuve.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/pebazogi.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141781b38c6e---zowovelefukejufilezuvejas.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/12228020762.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/20292980977.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/widiguf.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/12648608979.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/1003991607.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/nozexelalirumewi.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/17635218730.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/77718093038.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/natetojapipawuv.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/gotanupawizaperija.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/52957409339.pdfIn PDF document text
    • http://furniture83.com/upload/files/bugipisoboborozabujidufi.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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 19684 bytes
SHA-256: e51252d5daaf0bdcd5b3b2004b3710ed0299da8c864a050ad04f8f6209fe479b
font_02_sfnt_off00012ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE6 10264 bytes
SHA-256: 124347b392b9e4d28e09a76d35e1796d1d1a9208e95a14799e63097a87ebc7d3

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