Malicious PDF — malware analysis report

Static analysis result for SHA-256 626ce3d62a542d95…

MALICIOUS

PDF

73.6 KB Created: 2021-09-20 14:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e20f00ec4693971335cecda246943414 SHA-1: 502a5a66327031c8867535c6aaf29eaa30d9ac87 SHA-256: 626ce3d62a542d9571f32d9d5abb176aa446b3612e12e707036113d39408f04e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external websites, many of which are likely part of a link farm designed to distribute malicious content or phish for credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://activepymes.com/pub/file/mupominunorajevalofug.pdf In PDF document text
    • http://ailizia.com/userfiles/60287153.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109061420111010.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/doniwolonete.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/82325795488.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/20896146016.pdfIn PDF document text
    • http://ccsl.asia/files/sepulubaxopigulewobove.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/wuxagapunixorixowu.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/dafunojezizulejiso.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/nafoxafulaw.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/kofavilomox.pdfIn PDF document text
    • http://belst.by/upload/file/27855866904.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/sawafegutifumagixowar.pdfIn PDF document text
    • http://coumert.com/images/file/75296225742.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kibuliruxovijenajopox.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/36105254837.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/9429thtt54im5cq3e0lmh1c8fg/dovajed.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/gipefid.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/64243764731.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/39551916389.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/46609098924.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/dujepikalijukit.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/73347919502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=real+racing+2+data+downloadPDF 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_off0000bea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA1 16356 bytes
SHA-256: fa4990aad27cd8af34107a21cb248130d75d6e67d1520e09ccbbaaa6857de5ee
font_01_sfnt_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 10628 bytes
SHA-256: 398e768053dd0804e2caece10ec9d306b50998ad75cfd5e44ad9f4f939a4f4eb
font_02_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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