Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ccde73160d16d4…

MALICIOUS

PDF

75.6 KB Created: 2021-02-06 08:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ebdcd25c294d4a8e53ecaea53653268e SHA-1: de10279851b1366eac4d37ef385f98aef346556e SHA-256: d9ccde73160d16d46bbb136fc68aa5df984f6efded716b4b8c485524db0ed909
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed to generate SEO traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/wb?keyword=company%20profile%20sample%20template%20free PDF link annotation
    • http://simcars.ru/jarvis_for_mac_download0rxlj.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/eAMwAhe/87768576946.pdfIn PDF document text
    • https://tisogile.weebly.com/uploads/1/3/4/7/134728595/fuzifar.pdfIn PDF document text
    • http://graatorama.fun/spades_card_game_rules_2_playershz70u.pdfIn PDF document text
    • https://zatalabevixet.weebly.com/uploads/1/3/2/7/132741241/mulum_kiposuselilutix_soxoxafatukujow.pdfIn PDF document text
    • https://xevefoworux.weebly.com/uploads/1/3/1/3/131380592/woreko_tufenojekijil_badotedujuda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/document_management_system_project_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/42488967390.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/86245958800.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/sync_contacts_into_gmail_android.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/appendix_yahoo_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/94573918426.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/cannot_twitter_from_app_store.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/pakako.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/incarceration_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/sivuzudusopelesulir.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 5052 bytes
SHA-256: 80dad8b4feee6314039191d8403dd0dfdf7fab08b6acef8899fe5fb996d413c7
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10060 bytes
SHA-256: e29fec61c1fdd33ed45f208ab0c8ffa8cc3f998128f57076e39d6867e14b58d2

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