Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb9a4f7742aa849…

MALICIOUS

PDF

99.3 KB Created: 2021-09-19 07:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 433ed66f6ce9ace06d78095915603311 SHA-1: 43456006ad57254b9ef2b2ff9a14d299a2bf54d4 SHA-256: cbb9a4f7742aa849b69e5db1c1a391e4e32f4ac6bf5af7170582fe7edd7abdef
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting the PDF is a lure to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=charlie+munger+the+complete+investor+pdf PDF link annotation
    • http://1yunnan.com/ckfinder/userfiles/files/54190594529.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/tobixixilavikewoxegolopul.pdfIn PDF document text
    • http://gensugroup.com/upload/files/bavusunumid.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/xazidukotefigoludivobo.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/xawijetufam.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dodopug.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/49374971628.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/6886988659.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pagaruwimigumofobe.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/5225037313.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/31796198967.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/fusige.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2b23ff48---xosevitarikoxenokab.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/lusowefiravutelosup.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/78470922412.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/9125631567.pdfIn PDF document text
    • https://atavio.ru/files/file/rokedulirimenakanekar.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_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 11264 bytes
SHA-256: 78af4c558d912ea8fe6305e882d2f6a5a9716139b1b0e42a830eb229898781a3
font_01_sfnt_off00013668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 18888 bytes
SHA-256: d69dc513c8d89de6aefd05acb0fad7da7073f7e1d66e808705f2f49616d6af6f
font_02_sfnt_off000167d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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