Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8812ed5fd920619…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 01:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c2e1c0cdcfc00aec4c5ca7ef44916676 SHA-1: ac09e5bf22b7b07779a2529c19096b3a67d60d58 SHA-256: b8812ed5fd920619afdb999a958b879e0d71aac2ea5fe229a3c056d3873e0bb7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or phishing lure. The heuristic 'SE_URGENCY_LURE' indicates the document may contain urgent language to prompt user action. No scripts were extracted, but the presence of multiple external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ringid.vn/ckfinder/userfiles/files/94563387125.pdf In PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/ravetowebiruluvu.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/66458344202.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/bivinaxexixomukafewila.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/5609189434.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/22538731454.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/mejasuvasazuwu.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/3498747821.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109190631539976.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/22535849003.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/40556748819.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/1283140075.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/27284152853.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/lavizenasabideg.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/xijafidepigago.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5a6789ba5fc2f582191080d914fc56a3/wirawuxuwuvemari.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2lo0qudnkci1u92ktbp6vn4g85/30542498910.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/25084429841.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631689417417616193.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/zumufugatuwe.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/53648937143.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/65961545314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+logout+of+messenger+app+on+androidPDF 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_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 17352 bytes
SHA-256: b852f934566cccbb105f948659f01b3cd23b7c94e2143eac72fb8056c31d4162
font_01_sfnt_off00011bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDB 11016 bytes
SHA-256: d0fe2d3fe9e926fce4c1de22e35a8d0ab44b3977b04a322b6f61f3180c6a4871
font_02_sfnt_off00013546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1