Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0efd0153813852…

MALICIOUS

PDF

77.3 KB Created: 2021-02-13 17:48:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9cbf7cfd76291a91254768b11eda9d23 SHA-1: 61f239079f38eef671a13ce028f9c55eebc87475 SHA-256: 4f0efd015381385219cf1c55ce411a86890664db7f6346d7936ea86956260297
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a mass of external links, indicating a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains text related to 'Ucsmp math answers', suggesting a lure to attract users seeking educational content.

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://leonvi.ru/123?utm_term=ucsmp+math+answers PDF link annotation
    • https://cdn.sqhk.co/mifigatira/Lhjjfjf/16807105663.pdfIn PDF document text
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/pabiluvenu.pdfIn PDF document text
    • https://fasexonepagi.weebly.com/uploads/1/3/0/9/130969542/novukasegim_putoguj.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/fafezozinolo-tedutuliketub.pdfIn PDF document text
    • https://jikizukudelo.weebly.com/uploads/1/3/4/8/134879768/04f15ed.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/bb421fe8d5569.pdfIn PDF document text
    • http://merishwheelrecords.com/persona_5_true_end_guide46scv.pdfIn PDF document text
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/zuwusunakobire_tupesonuvad.pdfIn PDF document text
    • https://cdn.sqhk.co/xifusajexom/gLo2ghc/ecru_jeans_petite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502336/normal_5fe23a8c58f23.pdfIn PDF document text
    • https://riwusivi.weebly.com/uploads/1/3/4/9/134900433/ziwewiko-tugezo-zozesokuzo.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/zafirawit/siradagetef.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/self_introduction_powerpoint_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/bts_billboard_performance_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/bogglesworld_grammar_worksheets.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_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 5224 bytes
SHA-256: 5156452d74ace393acc404e459bdc95cc1d2b1b9f58eb133b57854e9db37a43f
font_01_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 11316 bytes
SHA-256: 953cbfb03485d740619261497dd97eca4b1608849b0258cd6964d528ab6dfb18

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