Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9808bb481fcd67…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 17:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31bfa6e5e5493c80d4a5fa1c6b2019cc SHA-1: 88269600d907084f260dec4a8c505c87a18e3ffc SHA-256: ca9808bb481fcd67091271626bff5b911ffe41a7b13f2c298d2c26a2d6829b69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://motoralbini.it/files/file/25995822276.pdf In PDF document text
    • http://gorod-r.com/userfiles/file/82239806217.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/vitibizunivu.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/60144870204.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/60450683219.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/jizuvefumadomofadebel.pdfIn PDF document text
    • http://baove247.org/upload/files/bobamexodiwosiwawe.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210920120431211.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/70050612847.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142272210b98---wotedovowafufakalixiz.pdfIn PDF document text
    • http://gojjang.com/uploads/files/damatipinolapane.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/80260447622.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/70603488202.pdfIn PDF document text
    • http://balone.net/_upload/file///79215876965.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131bfe27205f---76423908019.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/gevowezumidumi.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/19588090487.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/wutin.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/gajarupevimijirexijexeviw.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/24128932028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=current+android+software+versionPDF link annotation
    • http://tes-sys.com/uploads/ckfinder/files/20210912/16314031369609.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 15532 bytes
SHA-256: dd7f9e6e7f397c95a6aa16b512352e342598d5fbedd5976cad4f97bf6fa36d88
font_01_sfnt_off0000d6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 10584 bytes
SHA-256: 1834d4119ea36a43b1cd79ce1362f6f6f841641eb999597d615c1dfa824268b1
font_02_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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