Malicious PDF — malware analysis report

Static analysis result for SHA-256 113b7e398a970677…

MALICIOUS

PDF

94.7 KB Created: 2021-09-16 01:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef89f5cec379c1f09a24e5ae80bc920a SHA-1: 7f44254f826368d3bff97a2add5f16827d79c5fb SHA-256: 113b7e398a9706776a82a6c1e8d91da31d3a8a26020a1944d736eafd03cdfec6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or content distribution network. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic firing strongly supports this. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://megalabsrl.it/userfiles/files/vagogalesekiwoler.pdf In PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/nenuseparozuvivadukiwa.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f51ee24281bb99c9e8d7d7e47a24651f/didaxadopujaduvelutugipe.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/34090613478.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lonoposonureselusugaxo.pdfIn PDF document text
    • http://timebymtm.com/upload/files/76800462841.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/zijuzav.pdfIn PDF document text
    • https://onecre.com/images/content/files/semodage.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/73230160459.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/17107416979.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///82225086726.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/79364157252.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/41628879608.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/52379859282.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/sikivaviziguvumokofi.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/xosol.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7ad07079178417724dddc3af77bd4175/feferunaputagu.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/1077774721.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/23988477521.pdfIn PDF document text
    • https://inks.bg/userfiles/file/85719532739.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/91021502865.pdfIn PDF document text
    • http://kccmaul.com/files/files/wivedemudenomiwuda.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/roxusexiwezaguroz.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/71456741664.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/89458892824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=all+ps+plus+fortnite+skinsPDF 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_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 19436 bytes
SHA-256: 8c02ae19d746b5213eee737eed0172fd0c5ec453b80c882b27a4d1a83738c28f
font_01_sfnt_off00013d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D77 10360 bytes
SHA-256: 883f2ba3d418a673e0e6a266591f2a7a99b838b74290c5018a411d3bfb3a0187
font_02_sfnt_off0001550e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1550E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1