Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed504cab06248d5…

MALICIOUS

PDF

71.9 KB Created: 2021-09-30 14:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2cdc124099fb50fa1ef70647eb94380c SHA-1: 4af298bdc638489a97ad36127241c0dc8a40c845 SHA-256: 8ed504cab06248d57fc4d1b8cc639c58612d89185c20748003fa30ae9cca9e45
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://pistant.ru/uplcv?utm_term=qr+code+generator+javascript+example PDF link annotation
    • http://w3-japan.com/js/upload/files/58235343995.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/juxemaf.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/81610728608.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/20953517645.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/lazemipuxogatepimimew.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/88897613509.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/19220476811.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/jufogakufepimevekaritopi.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/83515400647.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/af58f964b0399339691d6cb2c48b2e54/13791353168.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/10777089824.pdfIn PDF document text
    • https://proxus.nl/file/kodazibanemevure.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/57060914113.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/50288378033.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/rawapumigoruk.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/7726718038.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba1528889b---77124454632.pdfIn PDF document text
    • https://timminsrenovations.ca/file/wtwWaDTr3r2VgwEW.pdfIn PDF document text
    • http://chengzechem.com/upload/files/jegamela.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/98223732446.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///xelidibu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/bufojuborukudonijiku.pdfIn PDF document text
    • http://www.depomatrial.com/file/20581598491.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/25627443155.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/fedefejawabubanagos.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/84227074060.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/62527079248.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_off0000b54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54D 11216 bytes
SHA-256: 0c1555a24bb2b5787320a6af9ce3a7af9f7f3b07d32fa7d2b5ea379b7d0aa875
font_01_sfnt_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 15888 bytes
SHA-256: edc92546759dcbec97ff79d17208fe3b8ca33a13acb49d97b1c1cc0eb8717d29