Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cebbbf3816b946…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 23:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d6a7852dd1acc466dcd3a4d70ec093f6 SHA-1: d35f8121f54cd46c1432547465ea7e4a343ea5f9 SHA-256: c1cebbbf3816b946424583f8d5cf0ba54f5be8a34edc7d2df0f48f4a78dc6157
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. The PDF also contains numerous external URIs, many of which point to potentially malicious PDF files hosted on various domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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 http://www.ishvani.com/www/js/ckfinder/userfiles/files/45130232514.pdf In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1f42f21df2e4fe6b54736c6d8ae54376/39716694988.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rtu2eb3f7iml7eh5iplnofp302/dudigofib.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/purin.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906145456.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/pazatuxadulageda.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/lojajazajalipiga.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/43974841622.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/moxajokefutotodozowewese.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/59382779390.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kexapuk.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/retusorug.pdfIn PDF document text
    • https://songhong.info/userfiles/file/xirijigop.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/64507673126.pdfIn PDF document text
    • http://parfumland.sk/upl/womepemu.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/jogukabosipadinajokev.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/59857734507.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/besanudam.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210911_C9D0437B019E3539.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/xaloletudeworisu.pdfIn PDF document text
    • http://irinabailey.com/upload/files/wazorewamoken.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/waparu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=video+maker+app+windows+10PDF 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_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 10728 bytes
SHA-256: d7ec94c0eadd519ae2c209589d835ec7b5ab7e48b2ddfe83f3ae8395a0049baf
font_01_sfnt_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001048e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048E 16508 bytes
SHA-256: dfb4c7f81d298f8ce49d02fca2c9387cfafd11fcb6c30c060d672be526469d37

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