Malicious PDF — malware analysis report

Static analysis result for SHA-256 b210e655ac004be2…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 20:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7544eab8873824392e19e9995102bc8 SHA-1: 61630b01dceee749ad92b148c714b1fc68f522db SHA-256: b210e655ac004be2177fbffae8585a1bedbd6d3572e0ec8ed998397cd35f323b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It includes numerous external URIs, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://skykharchono.mn/editor/files/17774300312.pdf In PDF document text
    • http://siamsankyo.com/Uploads/file/jusesijetoxafeduzofutaji.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/13918417532.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/68078957218.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/sovin.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/mibevuzezulazubikozefiboj.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/satojaw.pdfIn PDF document text
    • http://seamacros.com/upload/file/botamix.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/55955267026.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/90480682982.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/juraz.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/pitawow.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/93413243693.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/39125756489.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/bogisedipatox.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36259790920.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/27998582055.pdfIn PDF document text
    • http://ubest.ru/images/file/titubi.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/didivakezonuzube.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/47122645627.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/26390507481.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2da3289295bcdacac2ea14a74ffbd494/gopilavepomoputufudonodil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=book+of+medicine+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_off0000aebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBF 10352 bytes
SHA-256: d0f975fc57097bec8ce82020323a2d52b17d51746304654d3614a6c689f4e827
font_01_sfnt_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 15232 bytes
SHA-256: dce27e9ce21f1bc41932d081afd60a950c4e218783b063ea09595c34b0ebecb0
font_02_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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