Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc381c71e70d6b8b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 00:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 286d80ae6fdcf22d91ba2a052b1377ad SHA-1: aaff45e606f2993c61d10322b1983baf8644d5bf SHA-256: bc381c71e70d6b8b3858ccd7a9cf4b841c0f66df6fd9c35d546d8c2427c8a81b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=tiger+woods+pga+tour+apk+download PDF link annotation
    • http://inruho.ru/ckfinder/userfiles/files/moferalaw.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/nazefe.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/rudewonuza.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/nixisapikexegovoxu.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/61070548150.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/woxiveposixijoxotedinege.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/56087540940.pdfIn PDF document text
    • https://hyper.vessty.com/_img/files/sixaweve.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/tifafefig.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/toxez.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/33212470206.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/29793621460.pdfIn PDF document text
    • http://schubert-hh.de/image/file/35849387732.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/24902347153.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/74136961426.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/2745029746.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/41353115871.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/zubuteziz.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/liluxijalotutenelisu.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/xipite.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/tiwavoranurupukekuzizuv.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/43539637327.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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 17592 bytes
SHA-256: 836b863a46a18bbadc0d844669ebd03c73e2a94fa5acb4a9b5e7b6f194156fe1
font_01_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10808 bytes
SHA-256: 026344d73d8c6a9cb64d8a0880def3a0d2b20bc15bf4b20336c8595faf17a820

Open this report in the interactive analyzer, or submit your own file for analysis.