Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6fab8beb5465031…

MALICIOUS

PDF

72.7 KB Created: 2021-09-08 17:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3acf8000b98d70108e923933d4ac2dff SHA-1: 36d86debe5eccb5a111c0145a7eeb4aaa4e74ea9 SHA-256: c6fab8beb5465031e79f0fc8612afb7bd7252c2c8c429ce19664a5abd00f071d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4dc4579929f0738b1d0f7ba2edf1dfdf/balatulajogegubud.pdf In PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/8047816982.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/purawokeb.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/29787585512.pdfIn PDF document text
    • https://digireg.org/upload/xogujulabokewalexotejodur.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/13632151943.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/vuvatafimivebuwelagovawi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/95442364586.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/76584338831.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/44395950836.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/78515363362.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/wofemuzinezogugoxilogu.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/7808722165.pdfIn PDF document text
    • https://ewt.cz/res/file/95756383852.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/tesulenamufujawelewin.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/24832004865.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/82510490376.pdfIn PDF document text
    • https://n-tlg.com/files/file/1599758089.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/wisesulokasipavelezuze.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vetadibakunesavevu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/70734874482.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/58pid4hnsvdfpfei123dh17q6l/simisesudedabitoxobitil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=2nd+grade+alliteration+worksheetsPDF link annotation
    • http://irodori.kir.jp/files/file/3148292952.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_off0000bbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD7 10728 bytes
SHA-256: 7e9d83ad78d848cd479ec37cf6f929f79a232285759a8845b700a38de3719e19
font_01_sfnt_off0000d44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 15968 bytes
SHA-256: 48a88c3298931d0936b0b7e354a9da6785e4bb13e82965d3265f996f355f7b6c
font_02_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1