Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d85acc03112c6e…

MALICIOUS

PDF

87.1 KB Created: 2021-09-20 22:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6db8f47ec7b434a39ec457c25b4a9ca2 SHA-1: c05e55f5c11d1e44aaefb242cb1f46b0263ed6e1 SHA-256: 98d85acc03112c6e065801a433f41fd36a48c027a88c7f54dd8ac784a5ff96d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, despite being heavily obfuscated, are indicative of attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://terminarz.online/kosmetyczka/krakow/files/poxegivetasuzumovigowek.pdf In PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/62137561989.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/fewarafuwimidozufufex.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/97041308579.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/vopov.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/53267699001.pdfIn PDF document text
    • http://digifast.cz/userfiles/vererudulunosobanesubus.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/15933542703.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/32364210489.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109132107488903.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/59964728073.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/12291602924.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/jafasufivuxujaziwaj.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/fetevavijivexufox.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec49c83bd5---17811394642.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/49844749044.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/tiwizenozadefaza.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/81623089720.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/67241889324.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/bulirakavonupox.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/rewajugajix.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fagixuxirotuwitetododibog.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/levezagebumozolelev.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/nibodadubiba.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/65371336666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cheap+house+in+bloxburgPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/linarim.pdfIn PDF document text
    • 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_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 10804 bytes
SHA-256: 2d3f402165203f6734547abeb10a9521b2096e513c721c1df86382fbeca5c153
font_01_sfnt_off000109f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F9 17076 bytes
SHA-256: a41873e4a15495ee29146bfcf2bde260b666552150cc8ee34a5c1a056f113cf5
font_02_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1