Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a81cc480eaf200…

MALICIOUS

PDF

69.0 KB Created: 2021-10-02 11:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 48e21f69210b7bfc59d04dd586d524d6 SHA-1: 43d307f0a980a356f07085a1d16a6c7724d0da9c SHA-256: 20a81cc480eaf2004d5aef532082ded81a279c23fba7876a0c6394aabe60ee45
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, indicating it likely attempts to exploit vulnerabilities or redirect the user. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for phishing or distributing further malware, with one such link pointing to 'https://krisoc.ru/uplcv?utm_term=pageantry+of+vanity'. The embedded JavaScript is likely responsible for executing malicious actions or facilitating the download of additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=pageantry+of+vanity PDF link annotation
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/87922040899.pdfIn PDF document text
    • http://chicopharm.com/upload/files/3198649848.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/rokigevovubamelula.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/56145311394.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/nowapukutemipab.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/14038328680.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-22/20210922160500854375.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/ripusolofa.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/56835453288.pdfIn PDF document text
    • http://merydian.pl/nowymerydian/userfiles/file/65677757687.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/70145966509.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/lememiwilidexufu.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/44619381481.pdfIn PDF document text
    • https://quote-supermarket.com/userfiles/file/saxozorulox.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/jivapiguva.pdfIn PDF document text
    • http://thaiurethane.com/userfiles/file/18795410461.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pai48s5gbbnntt6j947eugd387/xakozizatojimekavu.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/50924630706.pdfIn PDF document text
    • http://erdbau-rauch.at/8712495670.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/57619753213.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/nosovi.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://tongrentangthai.com/UserFiles/file/19417580141.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/39415413605.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_off0000aee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE6 16024 bytes
SHA-256: 1af23720506d4acd678918602f9dd21db05eb352c2a3ebab1c853bf97bcca2da
font_01_sfnt_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 10356 bytes
SHA-256: c99236bbe0e074095ca404ee34a12a70d40f6ad441e2d98f66f01de300c4141d
font_02_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1