Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5b12475949be63…

MALICIOUS

PDF

78.6 KB Created: 2021-09-12 23:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0953c2d7b8c6258fd54271acbd242eee SHA-1: 0b8ffcd30e8113b22312e0b3db9dd8abf1496375 SHA-256: 3d5b12475949be63b8c6717c0e939be4f56452da934c5f5890469aacf8ad506b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://etkindenetim.com/resimler/files/gejuvexax.pdf In PDF document text
    • https://daaeportrett.no/upload/file/71150712881.pdfIn PDF document text
    • https://majubesar.com/contents/files/57153830369.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/jegipudulewudixojazogif.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/18454280929.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/dofemutizosupi.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/2996918875.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b89ab654bb---xisolibajefimekapon.pdfIn PDF document text
    • http://santehnika34.ru/images/file/765322329.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210909000744257.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zititogekebisigolelixax.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/47894679916.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/44622238876.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/41110289564.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/56500540991.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/zigawubobovenaduvafewuxon.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kiroruwofofexodul.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/46886338819.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/mazepubujeg.pdfIn PDF document text
    • https://storycycle.com/ckfinder/userfiles/files/guvuvelilu.pdfIn PDF document text
    • https://masukpt1.com/contents/files/doritijikonokaposolefu.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c22b340b1---23833166130.pdfIn PDF document text
    • https://e-midas.ro/files/file/rebugolujebeb.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/70213114629.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/bebuvonuda.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/15026040441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lame_enc+dll+for+audacity+2.0+5+free+downloadPDF link annotation
    • 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_off0000c8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E4 11200 bytes
SHA-256: 33810b503a1fa4668e5b9bd3caf4c71083b67d32917f9193d15d470a894075a6
font_01_sfnt_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 18960 bytes
SHA-256: bfb65ba02fac3ee477cc241f7646209de4e11ead325a4d0d2b2eaa5076198c90

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