Malicious PDF — malware analysis report

Static analysis result for SHA-256 67662762dd63c143…

MALICIOUS

PDF

88.0 KB Created: 2021-04-02 19:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6363a0d3cd068b23e25451c30b87bdea SHA-1: efd7989fb4b26abb5544c824ed2838994d734995 SHA-256: 67662762dd63c1433d6ba8eebfd5400616128f585550a87dd9d3fa71f845b7b3
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains multiple embedded URLs, with a primary focus on 'https://nipisod.ru/strik?utm_term=historia+natural+dela+enfermedad+diabetes+mellitus+tipo+1+pdf', suggesting a phishing or malware distribution attempt. The PDF also functions as a link farm, directing users to various domains, some of which are associated with disposable hosting.

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 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://nipisod.ru/strik?utm_term=historia+natural+dela+enfermedad+diabetes+mellitus+tipo+1+pdf PDF link annotation
    • http://katalog-siberian-force.online/86675081849yl5qo.pdfIn PDF document text
    • http://evromotors.net/why_marx_was_right_summary02t8w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455901/normal_5febd0016d39e.pdfIn PDF document text
    • http://nesobaka9.xyz/joxubifiditotatiwazefobij6pyao.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388276/normal_5fe05d8e584b4.pdfIn PDF document text
    • https://cdn.sqhk.co/ketusugedi/HPhfjdn/rukibewinanoda.pdfIn PDF document text
    • http://pc-remont.website/is_social_security_payments_going_up_in_202035z6q.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/C14Fjgf/tusuzobodiwutixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458144/normal_6008d125f313d.pdfIn PDF document text
    • http://bestunew.xyz/privilege_to_user_in_oracle838ay.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/bbf4732c-d708-43b1-8331-7bf7c18fa56e/89363883693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c51bf2-6466-44b4-a8c5-82ac313ae4c4/44638935800.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/72846643236.pdfIn PDF document text
    • http://vatimofaxemog.rf.gd/womujogem.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/vimevaroseragafo.pdfIn PDF document text
    • http://xitamexud.rf.gd/wefujurogom.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_off000117d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 5340 bytes
SHA-256: 9f6d90305a5fdbd870017cbcb4c62fe7103a7da25a0c1cb1071c47fa7d9c7d3f
font_01_sfnt_off000129de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 11968 bytes
SHA-256: 0fa2abc912b6508d26507ce2b6659001b84ac3f3aaccd785eed8d2b511a0ea87

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