Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e82745ccc72e34e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 18:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3415ba2c04c63436906f4fd00398a7ce SHA-1: 8e773ae20dbe5a75dd0fcf19642e71f69a72b256 SHA-256: 4e82745ccc72e34e7ee8a7673f2b67c0a4e31e6a11f5e26f7f5b80edd2fc07d2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and multiple unknown URLs were extracted, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://lexprikson.com/admin/style/images/userfiles/file/82210572337.pdf In PDF document text
    • http://www.hon-ro.hu/userfiles/files/vixuxakiligigawebapaxuw.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/vikotisuwudetozototo.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/bekisikaloni.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161310831311f2---38201916032.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gerabujuri.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/tosotanodeg.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/60948157405.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/xatidesi.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/46398631945.pdfIn PDF document text
    • http://fygl.net/uploads/file/02165543987.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/44294505289.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/dutabo.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/79459769617.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/pasejuxugutakage.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/80341486001.pdfIn PDF document text
    • https://menu2uplus.com/images/file/nupiwovafoxudus.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/43800336908.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/39338961008.pdfIn PDF document text
    • http://santehnika34.ru/images/file/dilelazagod.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/82359919878.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/burafekozasutuvomajopip.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/fixezezevejiwoxebutu.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/38995115719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=live+streaming+imperfect+full+moviePDF 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_off0000bcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCE 16340 bytes
SHA-256: fc3c8cb871f46f4db3cc40f43749de6d6b579c56a3f883940b43b240c412bbf1
font_01_sfnt_off0000e714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 10944 bytes
SHA-256: 5ff7f5f7f4acbfe06924b016a4b6ea3762c5d70f57af1f754b52ff6af340e607

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