Malicious PDF — malware analysis report

Static analysis result for SHA-256 652e28cea4db87c1…

MALICIOUS

PDF

77.7 KB Created: 2021-10-03 21:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8537b974db23b6c23d1ccd6c095fb6d3 SHA-1: 9202b8b6749b48498aa897e869bc5bfe9409f874 SHA-256: 652e28cea4db87c1e5534e564d56ea135afa50cd2e7d43c0cddd554aff1311b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a tactic to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/xilodivitowulezalenisudiw.pdf In PDF document text
    • http://alacarte-design.de/userfiles/file/pasawobomopuridib.pdfIn PDF document text
    • http://biomehl.com/images/content/files/70365024769.pdfIn PDF document text
    • http://parateam.cz/file/xevikixusuxevuzonedabuwek.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/37478292405.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/fusovonifedif.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/bimol.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/54325651229.pdfIn PDF document text
    • https://langumeistras.lt/i/File/nezafumud.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/xaxigowedikasavavu.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/71689402001.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/gonuxamupupigejaveduv.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/ximufedimifevetelofawi.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/38216554200.pdfIn PDF document text
    • https://tigapilar.com/upload/files/85027152238.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/88529769845.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/pizewa.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091601140395.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/sabudafofopikigiduwed.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/movimolobot.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/raborenusopamoredixalu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c719967652---15561864924.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/mivinulukasadu.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/fojopelavirokibozu.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/wakoterufele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+restrict+pdf+editingPDF 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_off0000c4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AF 10664 bytes
SHA-256: 8f92a5367c5b7bd4b1762fde4ca10a7289fc6e48e9395e87a1b7c742fd3776bd
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 20020 bytes
SHA-256: 39a2695b405d62daa124d9c6dd4d25cbbfef02eff15563069241577f87c55688

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