Malicious PDF — malware analysis report

Static analysis result for SHA-256 4958054ba31c8ad5…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 08:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f9a48784b5888f8d70d010b3908167f2 SHA-1: 3c1b472344c9d72663e2c1941ebd35b804e179f8 SHA-256: 4958054ba31c8ad53b749271e9411624f6158c6fa42daff90ce2230ac8848115
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external URLs, many of which are part of a link farm, indicates a strong intent to direct users to potentially malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=relax+puzzle+mod+apk PDF link annotation
    • http://ez-surveying.com/htdocs/cljr/data/files/40520897789.pdfIn PDF document text
    • http://zeci.nl/im/image/vasiwilizagov.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/vefodibowigotav.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/17391739946.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/89343643082.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/98421064689.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/tolizixaziwivu.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/15722185631.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/getigadonuzimibewe.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/19624102652.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/nefebonarana.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/lifuxe.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/26089786986.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/navotanujif.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/49085128387.pdfIn PDF document text
    • http://klenderbio.com/upload/files/dagepixab.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/bebirilomiziroropenop.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/81701427180.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/linufekifeketipa.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vevepiruluzot.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/gurutuju.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202108312144501885.pdfIn PDF document text
    • https://senfina.top/uploads/files/62470854835.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_off0000d0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B4 10392 bytes
SHA-256: 0221f06042f56e85fddfb879bb622aaa847e947ed958e934251b6404d21fe1bc
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 18700 bytes
SHA-256: 38ba7dd18e3244029ee742f81afceb43696f06f6738f3452079224e56227b665
font_02_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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