Malicious PDF — malware analysis report

Static analysis result for SHA-256 981b0e2d049576ab…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 18:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ed825fe6958483c5510eb84a8072ebd SHA-1: e149bb01648d6fbfd63ee55b79409e01713f5671 SHA-256: 981b0e2d049576aba3b555d528556bbb023ad75a784e4ee31da8b7cbde3e4e39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=private+instagram+profile+pic+viewer PDF link annotation
    • http://magdrywall.com/project-new/christianbook/upload_images/file/pogukofisuloluvexeju.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/99702696981.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/78466750571.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/filuguroxijax.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/3231096207.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/39109649321.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/babidojuzikujawim.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/puviluledapujatososomunol.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/3602950278.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/wizuponulokifibevepiwu.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/25321629031.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/javadidupavomaj.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/mamef.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/13055501463.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/18473778408.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/49203239545.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/mamuwimaba.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/72592564575.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613134426e488---jumasaxaganuxogipilasivu.pdfIn PDF document text
    • http://nprofit.hk/userfiles/suveletefiditesiw.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/nitejenulim.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/98236651197.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/tavaxumulatodojaropizo.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/mavudovunekefitazilawabax.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/bemitifez.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_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 18004 bytes
SHA-256: 16bc6013fa504e65d38780112e0a3f6f413456221cbefa5aa08fd37bbc1d0148
font_02_sfnt_off000113b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B8 10976 bytes
SHA-256: 23f2d71b8592304a75f4011aad2c2f25d7b09c8e648364315cbe104f57fde174

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