Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ba5c9ad1484027…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 10:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 310d0f01620c6f33410c89ab5ad3b143 SHA-1: 433d21c5022115c5258955b7e1d6f9f8692136a3 SHA-256: 56ba5c9ad14840272256d5647d8559f961e903bd463fedbf161aaf408a9e8143
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, indicating an attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=peaky+blinders+game+android PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132475af2dc3---60197036191.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/68992752248.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/91716840758.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/kutezoluxedumupomog.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/72996902902.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/babosagu.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/12719723794.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/26822261775.pdfIn PDF document text
    • http://philipsphotographystudio.com/xuforinoja.pdfIn PDF document text
    • http://artdental.hu/editor_up/10904127992.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905215510144.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/pezibaduvitesogo.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/lagarufomosawosikelesuza.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/76237843373.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/83484661968.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/zudobilezaneruvoziponudat.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/vureduf.pdfIn PDF document text
    • http://lscapital.it/images/file/63117077289.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/dusuruv.pdfIn PDF document text
    • http://megatex.ua/images/uploads/file/4392305879.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/20845697228.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc1f2a886---seluwupa.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/tifejatofuze.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/wowujodiz.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109101705405121.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/juxexelupixapo.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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 10840 bytes
SHA-256: d332d73e1691ef5bde86e8abe073671538587089cb58922116c3d5ac77f3b3ea
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 17868 bytes
SHA-256: e666999d5df6652c38473602c8ab5925deb42e277de27fd90f40842db58263b7
font_02_sfnt_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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