Malicious PDF — malware analysis report

Static analysis result for SHA-256 85abead81e23d960…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 07:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 4df8510d85aac667870df725e14c2ac3 SHA-1: a991f951621ccf92d2b114eedc9af0620903ce7b SHA-256: 85abead81e23d960dbebbb88e167f5924f427c5984aa88002c80535643c4e2e7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dongkoo.com/uploads/editor/files/86631504172.pdf In PDF document text
    • https://stw-nowogard.pl/download/file/4213098185.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/14745228695.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/pagarigamikinevunuzubija.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/69059942595.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/jonigogikefaxikekurelire.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/riwesopokotapox.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/zizorerubojuzebulifib.pdfIn PDF document text
    • http://serting.eu/userfiles/files/37770506954.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/risodel.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/54361851837.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/24484904836.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/mufimugumesug.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/mafifefonofesadapesulalup.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/69061029496.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/fegeg.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/04/62410627065.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/lunodazaxiziwadilagalobe.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/47184529489.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/sidobiradon.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/i9qq2jh3eg8mbmt8rihfdhroch/rewogazizowinerovin.pdfIn PDF document text
    • https://fond.ru/userfiles/file/52597809112.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/90502878626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=may+tera+hero+full+movie+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_off0000d21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2C 17484 bytes
SHA-256: feed0ae07801a7000fb86751b23e31d3b46d45e5bf555ed6df8e87e8495195a2
font_02_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 10808 bytes
SHA-256: bc650d9b8906c782d1e7ca644bf1d973b4aa2e6e8ef4f7e0f70e7010e9510669