Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0634d90893c608…

MALICIOUS

PDF

83.1 KB Created: 2021-09-12 17:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59a95577e8ab8d03beb158353a0923fd SHA-1: a8d024fab90b1ea3544b8d6b361c2ee8d7ad8087 SHA-256: 2f0634d90893c608e18f0c01390190597f1ad7fa6f4ae6939faa69d57dbb5304
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or suspicious domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to lead the user to download a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thuanxuongmonmb.com/admin/webroot/upload/image/files/fuluvuwe.pdf
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/9701097909.pdf
    • http://gillsandgeckos.com/userfiles/file/dagizelijezitakoxe.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/lozivudulazonugo.pdf
    • http://inimtrento.it/userfiles/files/nalep.pdf
    • http://suamanhinhlcd.net/userfiles/file/sevimidaxes.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613051b70d105---9921352312.pdf
    • https://pasifikendustriyel.com/userfiles/file/48469128406.pdf
    • http://hanyuchina.com/upload/files/45478041207.pdf
    • http://abwrosedale.com/uploads/files/vizuboluge.pdf
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/pagininuso.pdf
    • http://nesemlak.com/test/images/uploads/files/88138956392.pdf
    • http://abwgulfport.com/uploads/files/pugujuzureterunivam.pdf
    • https://lbk-ingatlan.hu/uploads/file/dubene.pdf
    • http://epwuae.com/userfiles/file/tolisagutojofuvoparatex.pdf
    • http://www.deopendeur.org/imgUser/file/dawamulamumeval.pdf
    • http://floridare.ru/app/webroot/img/uploads/file/170703_24844121807.pdf
    • http://langyupharm.com/upload/files/jedak.pdf
    • http://nuitsdartistes.eu/images/file/lapuwijebarutavuse.pdf
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/koladomixedaz.pdf
    • http://ordineveterinarireggioemilia.it/userfiles/files/33523984372.pdf
    • http://scsychem.com/upload/files/89004524892.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=download+bhagwat+geeta+as+it+is+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 16792 bytes
font_01_sfnt_off0000f5a5.bin
4d4edbb1029025cce20e177acc2c54b68d454f3e97d8d2d59a34760eedadb2d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 18512 bytes
font_02_sfnt_off000125bd.bin
0de1dfabbb1cb37f9714f05d21ea6563a5d7ccf4171092d3338f223c46d5eb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 10904 bytes

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