Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33ad180db9f9b6c…

MALICIOUS

PDF

77.0 KB Created: 2021-03-19 04:48:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b95209722453624f88b9d22a8b85920e SHA-1: 7bbb0eac6b2187fa66eb42a370b220ff3ffbd043 SHA-256: e33ad180db9f9b6cc4dc0c753c9fee001861e875079c42f654a3f37cb9a514c5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of ClamAV detection and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=libros+de+autores+bolivianos+pdf
    • http://vijuziruzunubiz.iblogger.org/new_fonts_for_photoshop.pdf
    • https://static.s123-cdn-static.com/uploads/4388819/normal_5fcb6c998554b.pdf
    • https://cdn-cms.f-static.net/uploads/4384144/normal_6034f64fc31ac.pdf
    • http://zesijesagevonot.22web.org/toy_story_english_movie.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b89fa935-830b-4232-b224-6b0d1117e186/eaton_fuller_transmission_parts_list.pdf
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_8a5768ab09174a9a95474a2a21cd8764.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_67e7c56792314c02a7698d70092a7587.pdf?index=true
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_37f2b069bbd4418a9cc7beab67e2caf7.pdf?index=true
    • http://rovuwuruw.epizy.com/tifolokiz.pdf
    • https://uploads.strikinglycdn.com/files/f3404fb0-44f3-447d-9ca7-33fd11fd6fc3/summary_of_the_seven_habits_of_highly_effective_teenager.pdf
    • http://rejaramexalib.epizy.com/36233071787.pdf
    • http://koxogulu.rf.gd/gumujakunobugebagov.pdf
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_a1eae2220ce74eb2af66025a1e2c8e85.pdf?index=true
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_665ab463b8fb4f6486029d9abf497c2b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee3c.bin
57ce826dc49bb2e21061dd2484b53bdcf026a9d41ab603b5b86b0b9ff8845961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 5176 bytes
font_01_sfnt_off0000ffe8.bin
46240870b9b36ca372ab4012d6e83c2fd250db9548f05177692eaf0d0ff27770		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 11580 bytes

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