Malicious PDF — malware analysis report

Static analysis result for SHA-256 966e4057954ac89b…

MALICIOUS

PDF

66.4 KB Created: 2020-12-10 05:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 34991436ec3f746b3e61eb2471318356 SHA-1: d4c49737742f698c96ddceb161d9f7fc5bb1b326 SHA-256: 966e4057954ac89b1674954ab3b701dd04ff1fad02cc07fc4d69b3b1852eb7bf
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://traffnew.ru/aws?utm_term=mental+health+app+for+android+phone PDF link annotation
    • https://guzejanum.weebly.com/uploads/1/3/4/6/134681017/pisirowumawip.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/tinurerupuso_fumase_biwawobuwigigin.pdfIn PDF document text
    • https://veraweno.weebly.com/uploads/1/3/0/7/130739577/mekofiwakomujuw.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/jejulurowev/jivowo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5001e18c5c478ef26854/1606373377981/reebop_genetics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/7378894739.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/filtration_water_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/pikuwalozuzuzamuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/charlie_malayalam_full_movie_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/scarborough_maine_school_ratings.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_off0000c92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92D 4956 bytes
SHA-256: 818c400449c9646646ac8f86f718ad30ca7059f1f0ea4558ba7e262b50a7b297
font_01_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 10272 bytes
SHA-256: 5f77b97bfd760dc48a228264a0e0deeb975476f88ef59f5971cac591349310e2

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