Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61f29df0d8070a8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-17 07:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5397cf606f1e80e0ebff0f1a99bb0098 SHA-1: b3e8bddc9e6c164fd4871a5e32ed6e235216a84f SHA-256: a61f29df0d8070a84e1a43e651e5c5f69f7d7bb905c3086e4d226cf6c5e5305d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a high number of external URIs, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The numerous links, many on disposable domains, point towards a link farm designed to redirect users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://drafthe.ru/uplcv?utm_term=totok+release+v1 PDF link annotation
    • http://seanmore.com/userData/board/file/zadunalabojagatudejo.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/37009624964.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/gadugosilux.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/fojupimureliledosanagibiv.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/47656957140.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/67565430374.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/84e83f454dfa6854a5234eafb15d159f/87517525644.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/pukemeta.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/jupuvisuwij.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/48593256672.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/joneteloduwuf.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/roxosamewolizanisilebar.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/89488591071.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/xupukekasirotujotenase.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/wemodumavugakigosugav.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/70943823159.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207a9314be---9118067449.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/20294766006.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109091909387629.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/35092164481.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/ruwaf.pdfIn PDF document text
    • http://twilaw.com/files/files/22574620257.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/febunajopaxuxikike.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///jotakuribi.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/93932041020.pdfIn PDF document text
    • 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_off0000bc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC40 17244 bytes
SHA-256: aa20968cd06f744b2b51809e18d776ff281a66820dc5bc8ccacdf766a76a8ae1
font_01_sfnt_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 10076 bytes
SHA-256: 1850d00e87075fca00333cd6140c5a5b614559b6d601745558037fa8b6613dd8