Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b28834316a42db…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 14:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d93b24adad583d25641272cef53c4ec5 SHA-1: 81c1597078748f480bb4cde2d3dcbf84f248be7b SHA-256: 06b28834316a42db0c7a3da1cf268e5345dab5619a70bb938144aa9437bd627e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting an attempt to obscure the true malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

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://harlit.com/ckfinder/userfiles/files/20210908_093826.pdf In PDF document text
    • https://sieuthigo.vn/upload/ck/files/21473576193.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/4027508982.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/gufaxakanigewo.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/sisamagojoperi.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/64372898141.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631380010.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/68256594031.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/lakid.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/pobopidujisogemomeluretog.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/dapobenufisetagomejuxujut.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425c8032473---suzul.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/vekokowizilepozojeredekes.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/95770108746.pdfIn PDF document text
    • http://abc-tel.ru/data/File/92752571056.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/12100443339.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/7165818347.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161325abd54a8f---zomanonum.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/54502876025.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/bunedunapexukozap.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///xadugaredevitubavox.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/misujuvixokigosebikewate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=panchatantra+short+stories+in+english+with+moral+pdfPDF 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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 11156 bytes
SHA-256: 04a5dcc947f4061bd1dabcac56a04ffcaa05e61007b80d521e15cc7d5361c1e0
font_02_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 16544 bytes
SHA-256: 80780555d19033dc98e38582684df071e9b21c7aa23a978edd35d7c681a8d1d8

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