Malicious PDF — malware analysis report

Static analysis result for SHA-256 be46051fcd2c229d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 21:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9e19e4ba4d33e975c84d32cee8105cb SHA-1: f47262d993e8fb5555854feb3026d1391d85369a SHA-256: be46051fcd2c229d195b2df4fa04035b48c736a1bf7f04a1145d03f131b5e261
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, which is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

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://bwhe.in/ckfinder/userfiles/files/88771736694.pdf In PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/31198204939.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/lezasidegijirovemudiles.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/62879028278.pdfIn PDF document text
    • http://sinostandards.net/upload/files/dejaviduduwejetopu.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/75700042421.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/gikixipugubomaf.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/dejusarokanozekufufot.pdfIn PDF document text
    • http://qwerty.pl/_data/file/lawev.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210912005228.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/30195142242.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210922205828.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/popowejovasamopedike.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/74802065479.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/novoregi.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/77810201745.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/tutusaxupaleteneduk.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109202126138211.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a94a86bd8---wulimoga.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/35377085876.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/lotogu.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/dixuliravujafer.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/61566603244.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/kefalazibamabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+score+hero+appPDF 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_off0000b2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 15804 bytes
SHA-256: 68461e466c5e6dcd882be52bad4ec81566422ad0e55fa903b49fd4bb5cb54473
font_02_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10508 bytes
SHA-256: 5f2e1a79fefc7fe9532307c6838b4f052e07742fb71d321ecbcdde68df6dd47e

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