Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b7d9c988c32f00…

MALICIOUS

PDF

110.5 KB Created: 2020-12-04 16:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e7571df283d5ef6800d50d7573d46571 SHA-1: 142ece3f2452c803da9eb23eb5c77e2ab6d311fe SHA-256: f7b7d9c988c32f005b1e355ef93448fb455cc92d7d48dd5ea7c0e0adc3fea17d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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/123?utm_term=persona+3+aigis+school+uniform PDF link annotation
    • https://bojemesazam.weebly.com/uploads/1/3/4/5/134598919/tegepu_bigujobuwogix.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/1392291.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/8f2c4113-6c57-404e-8496-e9075ef77aa1/darukarapadivowaz.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d93d1c8c7413143ea957/t/5fc506749d793648402c680c/1606747765799/42371324096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7fb285b-7be5-4aef-88f6-f7a36f055f9b/dizew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723e2c8e-d97e-4053-8449-0d04666172c0/kazinomukel.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd070345ca4f7902677638/1606223619392/56792697783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81263b8-169f-4880-b8f5-98042b5dcc83/kurogemokovowigure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fb2139-bdf1-49ad-a744-906393549d3f/jabotatugulixofedini.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a063c02f22b9d03629d/1606371849352/mathematical_leading_coefficient_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/importance_of_learning_by_doing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb2e9f55-57df-476f-a5c9-96cab509b94e/ndscs_calendar_2020.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc509327848ba205d335311/t/5fc5b92e9b1ed03538a38cd1/1606793518357/89065980308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ff1dd3-4244-4eab-a05e-ce0326f2d4e7/14413016572.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16616 5264 bytes
SHA-256: 207dcae41a96b0c105dbe30151197e14ccf1a5b8d9145e2649586a74f7c5869e
font_01_sfnt_off000177c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C7 11356 bytes
SHA-256: 2811debcd925cb72e343ead6879edc853fb5ff343ae84c72a7e62694611ef64c
font_02_sfnt_off00019eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EAE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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