Malicious PDF — malware analysis report

Static analysis result for SHA-256 286501f427824bb5…

MALICIOUS

PDF

83.1 KB Created: 2021-09-10 01:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1bc63fe3f8f0e5913bbec7cc682eb8ee SHA-1: e4e8fcea8841c3a6ae62d7cc7b5d0167a1d8a652 SHA-256: 286501f427824bb5d06e77d42cf8f503fd2c330bf85a64c0ac473c26e9c58cee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crewmak.ru/uplcv?utm_term=lenovo+yoga+tablet+8+android+update PDF link annotation
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/51331207083.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/81594696554.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/6897328341.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/nuvipe.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kuxozefa.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907232505.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/80870446458.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/todorakapexaluruse.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/37229257290.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/tixanidapufetu.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/mvne86u3bc2rt0u84lhjhpgt7j/63389214784.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6fe612b3---10503188569.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wewilodibixubope.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/83481982804.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/89406235794.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/55964265177.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/tajudi.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/busamepewexi.pdfIn PDF document text
    • http://panova-art.com/files/file/7883417710.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/49355598947.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/51034533216.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/66678505507.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/fajixikimezonimagonexopeg.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210907_AACF7B5808F9736D.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/73040467503.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/mudarikugex.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/wekupakutigeporozesomidi.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_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 17984 bytes
SHA-256: 47871eaa2907981bd5c887f04d11ab744f110a7693a058ec98e7c6f2f51ef756
font_01_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 10984 bytes
SHA-256: 58f386075de59960a3d3be34b31b745a4c8774dc6eec98c0c5781b48ac5141c5
font_02_sfnt_off000126c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1