Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b2d45c5a3e95ea…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 06:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: d901d1cffa4cea8f1d778b6464f67972 SHA-1: d2272c1fc045cd88073325aa09324840ec2471b1 SHA-256: 48b2d45c5a3e95ea5069f21fe4ca3e9994f16f843fdb08c2ba26aa2fabe45752
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, such as http://bagumul.com/file_upload/spaw_upload/file/20210913193034.pdf, suggest a distribution point for further malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://bagumul.com/file_upload/spaw_upload/file/20210913193034.pdf In PDF document text
    • http://fitsiluet.cz/data/file/37064098235.pdfIn PDF document text
    • https://kultmotor.hu/images/files/44202857877.pdfIn PDF document text
    • http://japhina.com/upload/file/zunip.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/c3e43868cd21e42e386035c12027bb30/zofabatanakafimo.pdfIn PDF document text
    • http://bamila.vn/luutru/files/jukafadabokipepukelone.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/zedokiralezokiforodazuxe.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210915155444.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/bebimefoneruliki.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/fupewubud.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/54966653113.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/42266922902.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161332e2fd3014---13176190461.pdfIn PDF document text
    • http://wohingltd.com/userfiles/migunozoxavisib.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/74875163902.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16132903c9f3ac---nidederanogexegagi.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/lizabixeperokuw.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/nolov.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/dimatezinotob.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/vejefepizowujur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=insta+booster+apk+downloadPDF 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_off0000d101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 10564 bytes
SHA-256: e2b38acfb2f705ac1ce305a9d3a6c6609be04463007fcdf5d9d1b4b62a1e6597
font_02_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 18788 bytes
SHA-256: 750fb9f0683969709a3b9fbe9597e116b9090798fd79664321628ed724c6b870

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