Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1aa740c66a135b2…

MALICIOUS

PDF

73.6 KB Created: 2020-12-05 05:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d0338e5aec55c77550466e82ff25568c SHA-1: b6b8d8a1a7251897eb5823c7c1f32af3e832dc3e SHA-256: f1aa740c66a135b2e402acc25b2e8f19d13545ae59e67fb11a9c822424f34964
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of an embedded URL and the ClamAV detection as 'Pdf.Phishing.Trojan' further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or content redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/strik?utm_term=joshua+in+spanish+bible PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5fa2a54bb478b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5fbf4120d5602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456685/normal_5fbe57f500184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375342/normal_5f9ccdb7cbb0e.pdfIn PDF document text
    • https://pejuloxekipural.weebly.com/uploads/1/3/4/4/134403187/nusuvidawenaze_gaxapupidoroxab_bazexewori_bodenofapifa.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/760c8caf-63da-4586-9dc5-359cec2d1227/greyhound_bus_schedule_long_beach_to_san_diego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4beaa7-f652-4648-9662-e2c640731c49/90259627370.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/http_barti._maharashtra._gov._in_form.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfff2111f6a4198480a438/t/5fc1138fe6d49a06bbb8021c/1606488976498/83425145344.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
    • 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_off0000c8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A7 4940 bytes
SHA-256: ec207b3f50b448e1ba7e9d9fafa8d3ec6b960ef95a68492814e4b795b9509e7d
font_01_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 12484 bytes
SHA-256: 31ea7ac106c825c4bcd20e29c289e7dd6da5e09cc803a2bdfbfc3fa89da89f9d
font_02_sfnt_off00010212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10212 16444 bytes
SHA-256: c64015ba368a18e75dcf88fa12f628d020f5e18e1c63e2099e9f87cc6d774483

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