Malicious PDF — malware analysis report

Static analysis result for SHA-256 43917bb0f2d46927…

MALICIOUS

PDF

71.0 KB Created: 2021-09-20 21:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0e6e1240383d73a84dfc39187f7cabd SHA-1: f5015aa98d076695c835b6ff0a22696ccc0baf93 SHA-256: 43917bb0f2d469279b288c2179f7b035f39f0ac35f32540f1b32f35a24c48bef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=wordly+wise+9+answer+key PDF link annotation
    • http://tcgardening.com/userfiles/file/2021090817502173499.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/87449829136.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/divudadetofebonexosune.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/nimozeraloxigajowutid.pdfIn PDF document text
    • https://funke.be/data/file/ridapapatililitifikax.pdfIn PDF document text
    • https://teamcode.net/upload/files/90335502237.pdfIn PDF document text
    • https://electroagro.es/pub/files/fipopowafen.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/rewavowigi.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/jofeke.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/70651738777.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/vejatumazasopaxos.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/50712601940.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/wuforalabidima.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/sabarepigutidozomebe.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/tiniwovik.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/80042388861.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210912035216.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/78304425125.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/donuxidal.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161397ac298297---86781525809.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/kifusozokudil.pdfIn PDF document text
    • http://dsfly.com/uploads/files/sujila.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/kagut.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/86564646333.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_off0000b554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD66 15836 bytes
SHA-256: 82d171b74bc03a9e255c5105ec5f34730a70a67bcd3bf6477d99878a327912b1
font_02_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 10596 bytes
SHA-256: bb7f507209fb27a6f8f4c79b461e4f82ddee54af9178fe871982b09ece13b724

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