Malicious PDF — malware analysis report

Static analysis result for SHA-256 8922ffa750f1d8eb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 14:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b88c74403c532ef423ff5d1a287bc5ef SHA-1: af4cb46bdb5f5a4b50d3d33e25cf58d80947d9bd SHA-256: 8922ffa750f1d8eb2511aebee785a6adc290119ea934c0a6b6421487dd60b388
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains embedded JavaScript, which is often used to download and execute further stages of an attack. The presence of numerous external URLs, many pointing to PDF files on potentially disposable domains, suggests a phishing or credential harvesting campaign, or a distribution point for malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kiavysocina.cz/UserFiles/File/zifekoketutex.pdf In PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/91229308129.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/jizujonawofamef.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/58240911119.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/95553774255.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/40855788920.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/sigej.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/ravuzisogugobutoxi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/16950379951.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/93423379216.pdfIn PDF document text
    • https://seikai.jp/free_images/files/zirolovorugatofexipimebu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161447384b6d06---nagerifipoberitor.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/muxenikibuxavutogor.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/76688344570.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/99941101831.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/ririnob.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/pudawejivelivetujetip.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161478bf36b973---62572961794.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/rigivudegewopokalunabivon.pdfIn PDF document text
    • https://ocw.tw/uploads/files/saxemebabuxufekunigibu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/37400555264.pdfIn PDF document text
    • https://aneri12.eu/res/file/37487647405.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/tadijoluli.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614025d56d76d---kolikadomaz.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/xuximagezoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=stream+ppv+eventsPDF 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_off0000bdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB5 10296 bytes
SHA-256: ca27f24e80a6d3c3300cabe63412b712f106bec39fa132f6bfd55bf7a12929f8
font_01_sfnt_off0000d4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 16796 bytes
SHA-256: 59854075dd83607169cf94726adad446dc24edc94a16e36883dba14def6b08b2