Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c1df19a20c15d9…

MALICIOUS

PDF

98.0 KB Created: 2021-10-07 21:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b05d4c94d8bdd942c9cb9655f69f1558 SHA-1: 01002377448a271382e91e8c5315c3fe4fa6635d SHA-256: 99c1df19a20c15d98b27f0e38122d402a602eb666ace55785d3e5a5f1066f2d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple external URIs were extracted, many pointing to PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and the nature of the embedded links strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://artepcb.com/upload/files/kimizumesusesabubomir.pdf In PDF document text
    • http://sinocelltech.com/filespath/files/20211004135319.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210916141113.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/69550909917.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/31356877911.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/13224025285.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/jerajigagujijasodu.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/jubex.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/93721254621.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/62697332844.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/jegiva.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/19120044250.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/xesepivazukewuvakelar.pdfIn PDF document text
    • http://cobmedia.hu/include/48942832912.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161518a89dbcf5---golefigodadifuzibubo.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/15776944325.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614954b84fbba---41727633184.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/danekig.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/fupalorulajizuwaguvime.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/vogusurakesopajasaxiw.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/99868770965.pdfIn PDF document text
    • http://home-plast.ru/foto/files/tovopirukomilibe.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/rawirofap.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/83375966208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=i+need+your+love+i+need+your+touch+i+need+you+right+nowPDF 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_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 10636 bytes
SHA-256: 947b102bf48e53996caa8c67243dd654ff8a942795c1ff2fb9df004fa6e5c3dd
font_01_sfnt_off000128dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140EF 21836 bytes
SHA-256: 446bed1103f1359f6e932bb7696e6c58699d17a250a29cfa9346b08ec2597af4

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