Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d8b11022464f68…

MALICIOUS

PDF

88.0 KB Created: 2021-09-09 16:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa37363f9f6f2f2538f024fc51eba6a8 SHA-1: 35b58a4c75cb376a2f643111f21814cc052a963f SHA-256: 53d8b11022464f6811a2c4bf2f7e969ddc1f3150c6aea7ff620a184b1a9f9bbf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of numerous external links points towards the document's intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://oniceh.ru/uplcv?utm_term=line+android+wear
    • http://uptownfallschurch.com/uploads/files/52518661773.pdf
    • http://pooq-design.com/app/webroot/fckfiles/file/11829793928.pdf
    • https://kisikana.hr/userfiles/file/16174407177.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/95397336767.pdf
    • https://marikakozmetika.hu/editor_up/mawemimuzu.pdf
    • http://vhshf.de/File/petuxadazi.pdf
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/9453289933.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161370a68622ac---96475698481.pdf
    • http://studiorinaldibedin.eu/userfiles/files/funokowunizeradumemowa.pdf
    • http://msmzizkov.cz/data/dokumenty/79539474411.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc59c393c---98195927341.pdf
    • http://abwingscolley.com/uploads/files/viworaxekofo.pdf
    • http://pnalog.ru/images/file/venukosopowulojufes.pdf
    • https://landbondcorten.com/attachment/file/5981c03231a272151a85c0ab59ffd160.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/vafoja.pdf
    • https://beruanglucu.com/contents/files/povafodox.pdf
    • http://stfurnimart.com/file_media/file_image/file/vabutozafinododi.pdf
    • http://smepil.com/ckeditor/userfiles/files/nexoj.pdf
    • http://the-bom.kr/upfile/files/28993261558.pdf
    • http://festacreativita.org/userfiles/file/xugajiloguniwabesidixige.pdf
    • https://jocafoto.com/fotos/file/vozuxozid.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/gefifoximexigaf.pdf
    • http://x-site.by/upload/editor/files/movusegifililirozikerunog.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e153.bin
4820d6252cff18e6853814dd2a819cbc13512e4a3ba0cca51364ef34261929f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 2792 bytes
font_01_sfnt_off0000ecbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 16792 bytes
font_02_sfnt_off000104d5.bin
e31ac9f3e02e4ea44a0363bb6f914475e953f8044b7c817bc7ef64eb9cb116d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 9972 bytes
font_03_sfnt_off00011aff.bin
c172e0ca06206363c9900f73ae3d2a2b100af7efc0262b0765d137235f6e89b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFF 20484 bytes

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