Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba456b45ecd4a57…

MALICIOUS

PDF

76.5 KB Created: 2021-02-14 02:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1e808641d458df2c1081094f4ab40bda SHA-1: cefbbde625db3a7debdf0513d620a8564927d790 SHA-256: 4ba456b45ecd4a5789a86e0a9850d7d4ecdfc79d23681039e4e9bbb309303e1d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a large number of links on potentially untrustworthy hosting, likely to direct users to malicious content or downloads.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/123?utm_term=cashman+casino+mod+apk+download PDF link annotation
    • https://vumokaxizojomij.weebly.com/uploads/1/3/2/6/132680848/xujajuweve.pdfIn PDF document text
    • http://pink-echo.club/calendar_2020_august_septembertikgu.pdfIn PDF document text
    • http://tehnotop.space/32655938083vvip7.pdfIn PDF document text
    • https://gaxifuxizuru.weebly.com/uploads/1/3/0/7/130739475/gixuwopobowol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425908/normal_600921fab183a.pdfIn PDF document text
    • http://mosquito.codes/rofedafarinelokulisipat1sztm.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/fonumaxaxasofidi.pdfIn PDF document text
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/1422042.pdfIn PDF document text
    • http://uscovidcharts.com/mathswatch_clip_205_grade_7_answerspdwvj.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/wekibik/canada_guide_kaiserreich.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/agile_project_management_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/38261377612.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_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 5276 bytes
SHA-256: c164ca4999d7e42b556d7d1fee83cd0f58aa633425d5f0ac6366bf7f13555b4c
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 2268 bytes
SHA-256: ad6b7d89c5fa709855afe00301495b63a95e2ac7f715e2abd2fcaf396ca2e5f3
font_02_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 11016 bytes
SHA-256: f2f5de66d051ec61fff818b9daceb48e4750f6ad692fd3cb4daccbdcec2a9306

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