Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9c6a8386553055…

MALICIOUS

PDF

80.0 KB Created: 2021-09-10 10:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c71e1c9f21f34a600716cca214604f4 SHA-1: 7f4ac5a70a1804985ee22b5976a9d8145549326a SHA-256: ca9c6a8386553055edec2caaee69cb3f04014755edbeee16f04e04cb57fbfe6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of T1566.001 (Spearphishing Attachment) and potentially T1059.007 (JavaScript) if active content is present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=the+king%27s+man+free+online PDF link annotation
    • http://firesecurity.sk/userfiles/file/33097417618.pdfIn PDF document text
    • https://timminsrenovations.ca/file/wyiAf3TPP18YUSMq.pdfIn PDF document text
    • https://egca.fr/userfiles/file/17418069064.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/41662889652.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/ridesubatuzikuvuvexubo.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/vonewadaxamagad.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905231825.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/10/19974793392.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/wowididurugemubof.pdfIn PDF document text
    • http://spakimthi.com/upload/files/xodes.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/94412716036.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/6362272665.pdfIn PDF document text
    • http://wdnederland.nl/file/86285262347.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/wegemevunuvodonibid.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/23272922776.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/kakaxarometajowamowavomol.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/vufiguwutomojug.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/59893252374.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/pipebonaribuwelevo.pdfIn PDF document text
    • http://insei.eu/userfiles/files/mipujikavoj.pdfIn PDF document text
    • https://anjingliar.com/contents/files/52779225114.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///fusudinaduselogupapofal.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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 10652 bytes
SHA-256: a98cdcd720b3cefd02d4e429bde74f7f3510cd47c0390868b66db2851511c7b9
font_01_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 18284 bytes
SHA-256: a07662b43811173804a3f8102516f30b10bb95878251b458111a6a16cf98dc24
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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