Malicious PDF — malware analysis report

Static analysis result for SHA-256 8650503341301fb9…

MALICIOUS

PDF

72.3 KB Created: 2021-09-19 08:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82e81206f2a69d662f0e7e8e3452499b SHA-1: fd0052c174544f86de34a3019c96452f9a2b03ed SHA-256: 8650503341301fb9f71ab47ee6611aa2d117fe88d4e76f4c36870113cc7dd351
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It contains numerous embedded URLs, many pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lee-trading.tw/archive/upload/files/77635822927.pdf In PDF document text
    • https://simbhaolipower.com/images/file/jilatewugesimisaxemim.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/xonoku.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/palanugesiruzofor.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/98823791080.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/pufuvogor.pdfIn PDF document text
    • https://successalpha.team/upload/files/megipatagakewutugajido.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/fozavazawumuzubunitatoz.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/94145214490.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/43932052215.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143cbcd8b8a2---roxidufazelomarazus.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/xovuwajunu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131abc266338---buwosilobejimuronerigiwer.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/bijoz.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/72409833560.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210914141214.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/59202459935.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/75471258990.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/71163658510.pdfIn PDF document text
    • https://renault-service.com/userfiles/judunawapame.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/75044637810.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/kemimaxexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=let+her+go+ukulele+fingerstyle+pdfPDF 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_off0000b7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD005 10876 bytes
SHA-256: d5f0f3b3b80caa3b575c52e4dfee4b4dc1d9b0829968805d1e28e5300cac0d8c
font_02_sfnt_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 16416 bytes
SHA-256: 927920bd683d3e371ed3577b4b6e07aceac699e94cb6c1e7fb0d45a3978b4271

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