Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e65bf2957117b8…

MALICIOUS

PDF

69.0 KB Created: 2021-09-16 01:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bea4b72d808bea1c2990acb9f74ff46e SHA-1: d01ac91e98d1bd8c9492572dbd4e5839c6e31ef8 SHA-256: 86e65bf2957117b8e4e83778dcb08ea22b729f9d6541050edd2dfb415c2345fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kristaldicarlo.com/userfiles/file/gudafisebotubugufu.pdf In PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/38586355463.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/55607245703.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/xanoridagebixone.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/13339226531.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/9614415324.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/mojetirusux.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/26195351289.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/xeravugevadoxugalape.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/vizodepijizarixuzas.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/27133832036.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/94800929876.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/pugasup.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/palulurifunapebipe.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/gujetozavi.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/xisolateranasuniraxufopov.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/raxepifeluteximaxu.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/39702921017.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/severaguderopubup.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/25550545453.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/jowopuwililesopibuped.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/domoxomudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=clash+of+clans+glitch+2020PDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 10656 bytes
SHA-256: 911d9c2590d67952c45d863226cea072fa43e41c3deb21af33f9f4fcb8bb3b08
font_02_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 15716 bytes
SHA-256: 398cf2b4454890d985ea3de16f4d0da912e7b8e06df2210a57c20686519b47c8

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