Malicious PDF — malware analysis report

Static analysis result for SHA-256 b096da95b895d210…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 11:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad6b9ec5d9ce96132fec8a6218a6ff16 SHA-1: 5cde4322d2533e20fe5a80fff1b254c6470d586b SHA-256: b096da95b895d21007be30b2e53ffd19eceadfd52783dd9b6ffc601df6604dea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=pokemon+leaf+green+master+ball PDF link annotation
    • http://straub-online.ch/userfiles/files/komewajopapowigipape.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/61323461793.pdfIn PDF document text
    • http://elitacasa.it/images/file/lisawivisuzigaf.pdfIn PDF document text
    • http://benetalent.com/upload/files/27321569556.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-14/20210914172354148397.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/68394715130.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/51226355061.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/lekukagevupobe.pdfIn PDF document text
    • http://podarox.ru/public/files/tesibevew.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/8dba256bae89ddfd6a7607488f624c6a.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/zajojujowopate.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/zunujuzalenepag.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/putasijopubafoxisosodemij.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/92171627380.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/zawesamazerulu.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/32790174648.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba42aef266---zofal.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/58968696989.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/724f9840b2018d942b491719581c4e77/46573835442.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/lefitiwuwegemuwuk.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/ratemojiniro.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_off0000e2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 10700 bytes
SHA-256: 6b83f0fdbbf805eaf3c5bf28b17d62208d1f72299a82ba6d51e353d30ef6dab8
font_02_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 17640 bytes
SHA-256: 94da7d94dbf0cad881bb8a8fe0bb6c813d5360a9b9f1831cd99db6e867aa4faa

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