Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b06b90cb80fd36…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 16:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6411f7354e6f8674a67a356ed4bc5ae4 SHA-1: 2460665f6af7f2aaf6e766d716494891fa221d64 SHA-256: d7b06b90cb80fd367aaaf7cd6f72e85e03e8524f7c282d1db11ca2fc5b741168
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing JavaScript actions, indicating a potential for malicious behavior. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://duhochoangthanh.com/upload/files/33985011456.pdf In PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zawiburafo.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/kuxuduwatige.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/mitakigexo.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/746ae7bd9341c3fc4b28802c6ce5a81b/7937536993.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/lesarasekese.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///potivujisipuwamonedube.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/valotimiwiburokog.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/63123126547.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/wulugi.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/23345979499.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/rofuvetafopewa.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/jitijopawulupebeta.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/30119975111.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15243784290.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/1241159749.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/tegadug.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/dufagize.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47755728198.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/81673294844.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b502c909b28ab02b98a2f0c12e438818/nodimuvex.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/molazedixalaxilo.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/vijexogufuwutorepelusale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ssc+cgl+coordinate+geometry+questions+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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 18828 bytes
SHA-256: ac08696625fc7be3013e21054592e64b73df42825bc2070b28f2a463cec1677a
font_02_sfnt_off00012bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB6 11396 bytes
SHA-256: d2c0acef4a4685200d51030eaf8455130586c41ca83a46185c7b58ea98a3e111