Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27ab1eeb1d17758…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 19:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1f4bbf38b0016fec2171acf9a4e1d97 SHA-1: edd311eba5a57330320866e5509e0336be2e2b41 SHA-256: f27ab1eeb1d1775882e3c652203db2fa0dfe2fb4ead304bd4154edc5833a677c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous embedded URLs pointing to other PDF files. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a network of links, likely for SEO poisoning or to distribute further malicious content. The presence of multiple unknown URLs suggests a distribution mechanism for potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://3sdent.com/upload/files/46226299023.pdf In PDF document text
    • https://pernambucoimortal.com/imagens/files/torizerupujoruze.pdfIn PDF document text
    • http://ge-mak.com/files/82964698993.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/30428060708.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/1532824376.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/23967047183.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/sikajewofizitot.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090117113973499.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/30725894303.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/56608186556.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/bepanexifefimifolelok.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///62219964807.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/nuboso.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/99785530560.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xikugekijumaratimesubem.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5bf60c443bf5438a2ab0071265ca9f26/sapiriruwuradazikoko.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/79793031761.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/75822002541.pdfIn PDF document text
    • http://sakem.org/userfiles/files/ruder.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906035012742.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/13182522640.pdfIn PDF document text
    • http://www.bash.cl/media/file/gofasanozonodukusulo.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/63578187893.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850e229380---68414402253.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/putuwibodeposerise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ghd+sports+live+cricketPDF 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_off0000c1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 10544 bytes
SHA-256: 8cdf6d13d8ad9cd4985f724518c422f2241d8f291e323f3ec671585918877d6f
font_02_sfnt_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 15716 bytes
SHA-256: 8fe5f8db6b10c96cd372e13c8e2f5da56bfe65ce2cd53110ed99e43269f0c317

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