Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2d6176dfcfb8f9…

MALICIOUS

PDF

73.8 KB Created: 2021-09-23 02:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31736a43f7929cfd76b9cd96999d853f SHA-1: c1b793facfd8683b5f8a0f2244b48d735fff38d6 SHA-256: cf2d6176dfcfb8f9f756a748e0d417ad3356c2280bd74c0e7d9f35cee7946aa4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's used to redirect users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://tecnomatec.cl/upload/file/80290639507.pdf In PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/nukojitewifeliletuko.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/31394217872.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9a672343f19c5382498bb320aeac84fb/dopinogogasekukuposupemon.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/49548998748.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210909_18_33_47.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/ravakofewudugopanewiz.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/legavarawiguwu.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/gakunijiru.pdfIn PDF document text
    • http://stroi-sistema.ru/img/lojixaparifegavatov.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/vobikolololisavasipi.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/tejiwesur.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/dekaruferodus.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/15377734872.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/wogudonabifujale.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdfc7358e5---5407939280.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///20219171245554444.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/92168120644.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210922144539.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/54874735394.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/62504514024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adobe+after+effects+full+crack+downloadPDF 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_off0000c001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC001 10776 bytes
SHA-256: 5cdb9fb4d1ff1ecb0347d49d569f38f5605164152661ca4b478368cd85f8c6ba
font_01_sfnt_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 15924 bytes
SHA-256: 39684af098b9e5a9de8c3bff715baf72e8911d2c12cef5e1716a3d143c001fb2

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