Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc16149934f078ea…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 16:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 547a78a1d2b9db4774770510c8dc1956 SHA-1: ca5b2eebb8085c19bab05ce7d8c8a33b2a1435dc SHA-256: dc16149934f078ea97728e117eeee3104fe456bcb351eeee2e7dfe32fa6c661f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

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 https://crewmak.ru/uplcv?utm_term=function+of+a+condenser+in+a+microscope PDF link annotation
    • https://tktravelkorea.com/FileData/ckfinder/files/20210922_E923107C3F556F27.pdfIn PDF document text
    • http://tradotel-riviera.com/file/dewegofoso.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/gijupuragalivowalokojum.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/jilodasunigat.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/88953596377.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/valafogepogibo.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/66596027000.pdfIn PDF document text
    • https://viettrungson.com/media/Files/84008521802.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/jupilox.pdfIn PDF document text
    • https://branches.armz.ru/media/File/57087470281.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/1599479654.pdfIn PDF document text
    • http://sksound.com/userfiles/file/dibevo.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/60218171142.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8cb0d76452fe61381849b6fce68057e4/52289627800.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613755cfe1d0a---26092595304.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/4770375770.pdfIn PDF document text
    • https://gencatakan.com/upload/file/todafeb.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/xojedaturijalinodobimad.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/rujagevolu.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/77716216376.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/risil.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_off0000ab1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC331 10812 bytes
SHA-256: 80d342e54f7882db73eaf2d3beb54e8fbdea64abaee22601f0339dc62d0f6530
font_02_sfnt_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 15100 bytes
SHA-256: 4888edcf5d36aa00841926a72c4ee34e79424cf738d9468c3c265552c8e6561d

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