Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d615e8b217538b…

MALICIOUS

PDF

78.7 KB Created: 2021-09-10 15:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: f1336f8234e2991dfe615ea94c502f3e SHA-1: 8f6d73fb5f13062198acdfe17379715be9d36473 SHA-256: f8d615e8b217538b40db474d11d26a02afe2a9014ac5742c734d911595adacc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://savitravel.ro/ckfinder/userfiles/files/26446938541.pdf In PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/96203034272.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/guwel.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/sarawekuzat.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/zodixusufimudixit.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192858375154.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/timetobajakadunuku.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/bepajuj.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/97087996831.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/sijokitisetatasozusoterap.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/sabex.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/bugodox.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2a65f8d4---vepidivetogujusug.pdfIn PDF document text
    • http://spiregene.com/image/files/20210903_054416.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/vaworajurosodujofexaje.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/duwowireleze.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/28302496090.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/5149677846.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e748c357e0d5cb2573bced0a3df992e2/54717788679.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/rujasenozaxudakikofix.pdfIn PDF document text
    • http://hbaoge.com/upload/files/sidorote.pdfIn PDF document text
    • http://elma1.ru/!upload/files/dexilotezulivifame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cara+connect+aplikasi+video+ke+tvPDF 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_off0000d0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B2 16904 bytes
SHA-256: da38b978652e50923a36bc4f9d48fa6d9d688bbb7d020946bde1c7f6873f8ec0
font_01_sfnt_off0000fc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 10696 bytes
SHA-256: 47ea5b30f678adc00af2eec124ccec6c294b7748f8283c52ec098f76882f2eb6

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