Malicious PDF — malware analysis report

Static analysis result for SHA-256 794829a1aa7a8205…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 04:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4980601975674f37842501ba85578cee SHA-1: 1c69f5e010a19ca7b8fdc3d003ce8d26397fcf55 SHA-256: 794829a1aa7a82057bd7fecc10c707e30983f5f515268267390a5d9292d1eac2
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning attack. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/kupadusodeselakarepopa.pdf In PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/8003846153.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/34896320605.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/70651704799.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/76407794028.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/4924417697.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/jabipafetaj.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021913846504980.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/berevagunafefifiritobe.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/90962350196.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/nufejowalonil.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/ginulopowupi.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/79477879549.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/vozifefir.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210913083617.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/gowubes.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zowuziwokapolunidinoxeda.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/78348673740.pdfIn PDF document text
    • http://skncn.com/u/files/85654699384.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/dakasenofejaxavinu.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/wolipagonusipevesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pablo+picasso+pdfPDF 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_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 19432 bytes
SHA-256: b2cedc2f4b09b014b398e88c9106bae4a7ffc6389e4c3ed3a19a76db73faf074
font_01_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 10320 bytes
SHA-256: 427e869deb23b49933e656c5046a1b1500500efff84e2d756532180d1f128867

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