Malicious PDF — malware analysis report

Static analysis result for SHA-256 5955edfe39831a71…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 14:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6c497d1fd0eee4d597388047bb78bf6d SHA-1: 437859c5e60ed1abd7fe25bc9df41d954640b51e SHA-256: 5955edfe39831a7146b2e93b45e6920746e48263037a1f859befee1271f7bc78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple URLs, including one that explicitly mentions 'download game sonic for android', suggesting a lure for malicious downloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further support that this PDF is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.
  • 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://allytemp.ru/uplcv?utm_term=download+game+sonic+for+android PDF link annotation
    • https://hippodrome-compiegne.fr/www/uploads/file/kibepodufitikitezov.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/74563173327.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b7e98a5f0617be422288ee08c0f3059a/xexotizegusonuvabutiwusov.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/161362a4625c0a---82068217366.pdfIn PDF document text
    • http://fpole.ru/sadm_files/mijobuzozujipebubumo.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/sudibawovikexezas.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/bajalozidutopuwog.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/23875813686.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/75283991390.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161359395146f8---vovip.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/98002655187.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/57871691916.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910081410.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/luzurovafej.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/zazujipu.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/78410601068.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/19333917541.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/kejapukakeviwepon.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/japetikusevubusonevo.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/66226282790.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/67792472115.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/vepaderudoxu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0tfdkcmrsoeuthnv500ipc9ij0/99368636658.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/tujufomi.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rapimazimujaluzifoponu.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_off0000b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD7 15080 bytes
SHA-256: 312024c1a00bbab4a01b364a5419de965e6911f89d2f572a25af0ee11d501e3f
font_02_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 10808 bytes
SHA-256: e4a28e76b146d40179f995398ac44bcbcd5e04efe848571ab1dbf5b3d26ec0d3