Malicious PDF — malware analysis report

Static analysis result for SHA-256 7707b779c295b7d1…

MALICIOUS

PDF

79.4 KB Created: 2021-03-05 05:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 338753c2cc9ebb89f174b6e3a3a4bf52 SHA-1: 679e4d8e57447c20aca6552c16407966ca7d5041 SHA-256: 7707b779c295b7d174f0f1041a47bd2aa7e672eb4c17dc97fd2ee13eab18dac0
186 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various external PDF documents, masquerading as a free software download. The presence of multiple external links and the ML classifier's high confidence score indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it acts as a downloader or redirector for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://botokaw.ru/123?utm_term=fl+studio+12+free+download+for+pc+windows PDF link annotation
    • https://cdn.sqhk.co/woxekivepi/DRih3if/best_old_games_for_ios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403540/normal_5fc696bdab424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454691/normal_5fe89af05a4b7.pdfIn PDF document text
    • https://bafiredevidif.weebly.com/uploads/1/3/1/3/131384403/02cfbd99c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_60138f08c3ff7.pdfIn PDF document text
    • https://cdn.sqhk.co/xavonepez/3WMVBqy/63967163296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_60203b8f6fde5.pdfIn PDF document text
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/wipeduvadofex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_6023b8e9c3651.pdfIn PDF document text
    • https://fatitabo.weebly.com/uploads/1/3/4/7/134757356/fewomuvomeloxum.pdfIn PDF document text
    • https://vipozuguru.weebly.com/uploads/1/3/1/4/131483083/057e9.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/ehiq44A/3d_sniper_target_shooting_games_itunes.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/hf2pujH/jijupowovari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fd9aa8bb8f9d.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/Csrig1l/21239266123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5fe8f60169cf3.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/f60845c0653.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f57f0e-92df-4251-a930-c02e78012022/69079571879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/604ab387-0d35-4a28-9f12-eca95e370d73/latin_american_urban_model_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808725bc-4b59-453f-b540-c33d210e7544/pl_sql_developer_jobs_in_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f71f5a07-ded5-4943-a62d-988a15c7f344/princeton_review_mcat_general_chemistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/244b28b5-fb21-4dfe-ac65-d1777529d785/what_are_the_forms_in_poetry.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_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 5380 bytes
SHA-256: 033f3f2e94f89239346d78ec8158d938fbf7a0b60b73212b0c15f4b99a3676c8
font_01_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 10488 bytes
SHA-256: 91d2df2179a298b5677e263899ecf49720229d0c58b33ca86a6d9e346eb31026