Malicious PDF — malware analysis report

Static analysis result for SHA-256 362c0633eae93f20…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 08:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a792d67d6c09a9346d21f52c67d3d4e8 SHA-1: 29b85b379c34728e329ad78aeee91db269bc5232 SHA-256: 362c0633eae93f20fb8a927e8416e097e6a3b25898cf8da1ecdc65efd50f2c79
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, such as http://derkwoo.com/upload/editor/files/96380515333.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://derkwoo.com/upload/editor/files/96380515333.pdf In PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/99318865372.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/96314777968.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/ferilalubexedolef.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/79783237094.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109050826284270.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/96613549004.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/wonurevivixezujarumuva.pdfIn PDF document text
    • http://nincity.de/inline/file/49098235452.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vadafidejidivalosudonaxex.pdfIn PDF document text
    • http://cpils.com/userfiles/file/nelusukowemozob.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/31946782932.pdfIn PDF document text
    • http://drironcat.com/images/file/dakifaru.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/sezutetulubejenizesesi.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wumope.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/93954092844.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///xepokevebet.pdfIn PDF document text
    • https://redac.ch/upload/11530055670.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210908122224.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/36956551115.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/kupib.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/59364841597.pdfIn PDF document text
    • https://tpk-m.ru/files/file/depexalegejijajed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=postal+code+san+fernando+pampangaPDF 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_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 10872 bytes
SHA-256: ffc13eff43077d9275cfd8e867e5071551e4c5ae36cab1553a3fef2ebf9b7128
font_02_sfnt_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 18656 bytes
SHA-256: 5beaf13ad2f5c4c5785ead0132ffd502da3d5d9db1465ef482e1fb157ce3e452

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