Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf19fa2529cbb273…

MALICIOUS

PDF

73.2 KB Created: 2021-09-26 12:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b63014e8fa1340dc6108b3b0cbc47923 SHA-1: 7377df8a5ca07f8bf26424af4f61c971d4b7e8fd SHA-256: bf19fa2529cbb2734f8b88dbd0423210ec8c53c18426b01463f79c618795bd53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to potentially compromised or suspicious domains, suggests an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9a7d476c1b336177859570f731285cfc/guzimirepumoninivatopan.pdf In PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/35930568520.pdfIn PDF document text
    • https://solturism.ro/images/file/22585993867.pdfIn PDF document text
    • http://synhbio.com/upload/files/11902244151.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/e90c7d8749dcbc4854748b3313cf1215.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/vojazubep.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/bomuwupabuwud.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319628dad88---82362746285.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/mabovabozenesijivada.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/9925398817.pdfIn PDF document text
    • http://nensi.si/upload/file/vofunatexojuwizolere.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/botofitesanep.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/fosuverepedatufukoguruf.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/batufezalexa.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/wuganekexixebe.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/sudoluruxewakiw.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/vodudorekuz.pdfIn PDF document text
    • http://hanleyresources.com/images/seragexegodob.pdfIn PDF document text
    • https://kildevangen.dk/files/vemuvulezudemawifo.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/totozisidawoxuvoz.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/13670958788.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/50836652910.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/31620675326.pdfIn PDF document text
    • https://beautydent.hu/editor_up/nupuvububeguzagobewasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+programmer+forumPDF 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_off0000b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88D 10608 bytes
SHA-256: 81cef8529f564da30a553ba4a9849d358769b54f103b7d45281191be26751e80
font_01_sfnt_off0000d089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 17556 bytes
SHA-256: 3a2144af5107fbd5db6e9a469876fe95b9e41dd3403a8348ebffcbfe209a95d4