Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2398f2b2216c3b…

MALICIOUS

PDF

88.2 KB Created: 2021-09-16 00:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4ccfa2dee769366cd2f1f715d7e47a4 SHA-1: 893e90584c0eba743483abbcffc4adbfd4c73918 SHA-256: ba2398f2b2216c3b7211542fbb0f9b5f951c813ef61be588dcfbe243452e9751
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which point to link farms hosted on various domains, suggesting an attempt to obscure the final destination or distribute malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection pattern align with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/35247430746.pdf In PDF document text
    • http://bkht.vn/userfiles/file/sagakedaxopisi.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/sorudefiropiw.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/ropatunavefenaf.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/3477782115.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/28485647151.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/47781869046.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/89342522205.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/14549608065.pdfIn PDF document text
    • http://prmakeup.com/Image/files/pejuxetexuxu.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/guzofive.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/pazirefuronotomaj.pdfIn PDF document text
    • http://fittbikese.hu/files/file/suribavevewuvetar.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5da3721dea45cfc7e6e0da00ac99c137/gawere.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/diwum.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/76777737857.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/56377311133.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/51980382087.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/tuwasokexufotexugepug.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/68859160260.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28906199744.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136bf5776d63---48918314461.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/76827297241.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/20313550972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dark+souls+2+ps4+modded+savePDF 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_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 18200 bytes
SHA-256: bfca76b7ce785ed11c54e32629f4fbcd9e1715f1d948f35b12f5a818e5d73471
font_01_sfnt_off00012254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6B 10716 bytes
SHA-256: 05327cf5de66c20810aebfa84a0d018740ea99ffc925f49e6a2bacdd12c0458f