Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fca253647d67932…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 09:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5cf583f0338bc6e75b679aa6f4a4c192 SHA-1: 2068943161a50801edc23f9039fd19d9445c05aa SHA-256: 2fca253647d67932124fddd13674a60e3aa75ce22034a311e723813f64a0f0b1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, strongly suggesting a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://dakdekkersindex.nl/images/uploads/25850408851.pdf In PDF document text
    • http://dj-maily.com/uploads/pages/files/31130479533.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/66378982504.pdfIn PDF document text
    • http://martonelektro.hu/files/file/bafalew.pdfIn PDF document text
    • http://waypl.pl/upload/File/vamezerinipol.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/16284425410.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210908_8557DE30B327CF07.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/limowaruwanoku.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/lusakolodamurisoke.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/kiseripep.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/nenipoximogowoto.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/56168213381.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/91459319342.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/53984271046.pdfIn PDF document text
    • http://arablift.net/userfiles/file/munugakilodorulewodesetu.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/nonisuwokitofizi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/mawenigi.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/51890324453.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/kurasitatabexufiref.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/gazanoxikomirinevegamame.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/murofonotakirapojikerete.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/47906639412.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/27646299001.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/bejuvujawatav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=my+phone+ringtonePDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/temadumariwijol.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_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 16684 bytes
SHA-256: 9e68ff216438d88206c75b63289cd0dfa47cf8e2fa1a12a36f925018f8b2f49f
font_01_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 10260 bytes
SHA-256: 60a2f48fcab7c113aeb0897dc66f59340cbef65c835b85a39be1b059b7104e8e