Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd33394dfbc85e32…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 13:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d08406baf24f65e907841b600971de3f SHA-1: 059b2df4e58ff32f15ef5fb50fb47c5153b9af1e SHA-256: cd33394dfbc85e323e4019f15c14ffac1a032e994af53fd4ab7a5f690562d2c9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to potentially harmful sites. The embedded JavaScript may be used to further obfuscate the malicious intent or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=mod+by+sami+gaming+dragon+city PDF link annotation
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/lufuvakupowiguxixukikufa.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/59978513902.pdfIn PDF document text
    • https://digireg.cn/upload/juwolobuvikoperal.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/90709227098.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/bewexerijesutixojurowokar.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/71016563862.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/gebadizozazofokazex.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/11221421576.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/72940792421.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/wikuwumemenetonemefoxijik.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/68679653061.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/kaladedowupirodoxed.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/37936489672.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/81631565596.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/87351179268.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/36917819225.pdfIn PDF document text
    • https://network-italia.com/file/91196179137.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/botutixurufokugekawamodas.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/57df4f9aca0c088decbdf7a7fc08c47b/27017149665.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/tezek.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/pitaxabivusevozanufuw.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_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC43 17804 bytes
SHA-256: 19ed9d885574d2a5734ed6b3a3db0e5bafdd3652451b150bd1eab2a74f2135fa
font_02_sfnt_off00011a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A24 10784 bytes
SHA-256: 9443ecd4b590687435bb20db4bd3e496bea01e6d80d89a32f53fa010c8670c1c