Malicious PDF — malware analysis report

Static analysis result for SHA-256 8169bb2fd82b9dc5…

MALICIOUS

PDF

93.0 KB Created: 2021-09-13 09:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bf01ed6b1a1ed5865b89a975b2a8d2b SHA-1: 17af4ef1b3662f1768871a0acb694cde7f5e1ad7 SHA-256: 8169bb2fd82b9dc536558d13b0fa8f7209199c82945de844920d8fcadbb1be7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also acts as a link farm, pointing to numerous external URLs, many of which are unknown or suspicious, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://nriloan.jctoursandtravels.in/files/xubokabelafebaz.pdf In PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/direm.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/lapujurumozixot.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/44068381237.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/89678729725.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/maluzesujekofakugekuraku.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/xematunam.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/97453493780.pdfIn PDF document text
    • http://newworldss.com/uploads/file/63353020186.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/eacb1c7936be20ec7910313ea82d815b/juzoravezumorosawew.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/17157567510.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/32026227502.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/jebigamajedo.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/gosuzuke.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/xitezoxelogedotonedox.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/88614721848.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/rekovuw.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/58420044384.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e45956ceac---77988554879.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/reraxapudixuzalufedepaga.pdfIn PDF document text
    • http://pololanna.com/user_img/files/jobunapidafigixunabefo.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kubijifo.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/sasupuxamuzigigulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dream+home+makeover+gamePDF 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_off000109b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B5 17448 bytes
SHA-256: 089b7d9d3dec50e6305de7286b8cbf489c99f7b96e34bdd038b4f49e8b513cf2
font_01_sfnt_off00013751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13751 10208 bytes
SHA-256: ab40ade6f7a42b855be93bee12eba5c87622d0ad6dfbadca2819cd3dc4a3c4a9
font_02_sfnt_off00014e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1