Malicious PDF — malware analysis report

Static analysis result for SHA-256 628fa2836c30edf3…

MALICIOUS

PDF

69.6 KB Created: 2021-10-09 04:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5a02df2b312e454babb84162b77d8f1e SHA-1: 82cc1d9d4aaa550450504125210d6175d82a1e0a SHA-256: 628fa2836c30edf3fc38fff9366c3f65daddb1a3fd4005814639ce012d47f25a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing operation. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://wastran.ru/uplcv?utm_term=equivalent+fractions+word+problems+4th+grade PDF link annotation
    • http://hissekurban.com/resimler/files/lasolerepejo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c0e854cf99---34994794957.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20211007083829115.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/78522058458.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/vudodatuzupukexiwum.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/rijakosawabez.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/medejijozanib.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/116532070.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/30456641300.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/9640308435.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xipubeximivobakar.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/82340531285.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/30230755732.pdfIn PDF document text
    • https://simorgh.it/uploads/file/52194610677.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/16potvkh1ls252tu21aqv0e88c/vasipifijazoxudu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/37516446297.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/3495774714.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/66255305832.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/53050483645.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/68923273423.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/86476878310.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_off0000b0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A4 11664 bytes
SHA-256: 3d5ca8e44857a89990df705c5e55fea0235d3efe0e040de3a32c732e8890cb96
font_01_sfnt_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 14772 bytes
SHA-256: c94cc9f18e3263157a938f617b1b8ad5c1ca744cb8c18a5b2f8433e77153f7ac
font_02_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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