Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb7574268e0b4d6…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 20:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 34262476164fe1fe64fa6fe0562b3ebe SHA-1: 4fd4057383b424758303f39f08ed15f38078b2ae SHA-256: 3eb7574268e0b4d628ee73fb2bc431e5e7ff9af1ec1ec0094243055e447907a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=pokemon+dark+rising+gba+rom+download PDF link annotation
    • http://smartdeal.pl/files/upload/files/zakuvisetaxi.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/70776567443.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210924050007.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/99697508769.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/73275429349.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juguvedi.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/bibitufelivub.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/60655290031.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/besug.pdfIn PDF document text
    • http://oilbasaro.com/web/images/ckfinder/files/20210909023243.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/62170798761.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f2d15173c---89603413432.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/50772594040.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631750972.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/81798532989.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/14223358626.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161484d8890a2d---98079250542.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/14392874363.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/95723119756.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/6302806434.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/83097255104.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021090504480383.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/49682134325.pdfIn PDF document text
    • http://expobar.vn/app/webroot/files/images/pages/files/lovivifevinopu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DB 15228 bytes
SHA-256: 5f0089584bd64d4c8d9dc94ad2d8cbb39934b18ef830d41bdd3a90b5a55409f8
font_01_sfnt_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 10812 bytes
SHA-256: ad75e070fc5433071c020ef8bf55bcbe5bdab5df8548576256419a793e1273fb

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