Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5eb5ac76c4808f…

MALICIOUS

PDF

77.5 KB Created: 2021-09-23 05:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6eb5ec7d1414212e386724ff17ad466 SHA-1: 4f93c982e25b920dd071cd7169a889d48e151a0d SHA-256: 9c5eb5ac76c4808fcceb4d3bc0789b749c49d54391fb6320796a9cd79d9f9fac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, suggesting a phishing or SEO abuse attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://hoalavender.net/upload/files/8327592350.pdf In PDF document text
    • http://oshcongregation.com/userfiles/file/majivemezojamosipopanat.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/60328644779.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/34953927997.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210906_470D789BBE74C813.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/21496916436.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/ravaxirunabadulopegake.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/bilakowebiximino.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/53866015702.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/58469955053.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/gozoterogukiredubi.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/funesipalupowikidanum.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614adbf0e12d7---99705097861.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/30155056806.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/4117980252.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/rugunisitof.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/82827287367.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/7160699788.pdfIn PDF document text
    • http://humanlitech.com/files/files/32366033419.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/pawozinawitunazeva.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161367fe43c0d5---sadere.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/kaluvemobiwakamamex.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/dalokapumapelitajub.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/jiduxujinapapi.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/49975917414.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/luwoximugiwarovezutoxegin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=telugu+web+series+download+websitePDF 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_off0000cba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA6 10712 bytes
SHA-256: 65cce4514dff09615b80810372b2ebd3476e286faff6465718362cce455c5a0e
font_01_sfnt_off0000e434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC46 17080 bytes
SHA-256: d9efaaffa5c1997dbfa0a42c2b94719422fa8ba51e57511cbc8a8c699656927a