Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f7948c0c80259c…

MALICIOUS

PDF

84.7 KB Created: 2021-10-14 11:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4198376165d11ab1b886af4d11d0f214 SHA-1: 81208a57f844dfbc1e033addae5010d18de8e18a SHA-256: d4f7948c0c80259c3f92048f121d6ba9fb8e8c8623609576a59eb327b78a7510
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://theorientgarden.iorderfoods.com/uploads/files/wajuxetob.pdf In PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/69848992534.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/54390491502.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210930_204337.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/49522763020.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/40955439581.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/28646742432.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/punikovibute.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/61791800290.pdfIn PDF document text
    • https://davnosti.ru/upload/kabemenafixagetawofi.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/dapezodalubapakuwomi.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/desitafur.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/44423190446.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/87954743365.pdfIn PDF document text
    • https://tadimtursu.com/image/files/20387247149.pdfIn PDF document text
    • http://klemanpince.hu/files/file/12258151173.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/10e6dc9f7058b0adce0684bee2cdd05c/zoxazolaporababog.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/pokusofitagofupodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=aggregate+supply+curve+in+long+runPDF link annotation
    • 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_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 10812 bytes
SHA-256: 92d5b20ef85bf1712bb9f2c601d4ee038df20c2641cbde57926123c785fd57c8
font_01_sfnt_off0000fba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 19584 bytes
SHA-256: 1839dad3bf8f0fa54a88cbc0fa3dafe23be6ea486631c9849e3dc976991402ef

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