Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf7cbabb6732beb…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 22:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73dbeaceaece928b9d25cb13ba56e783 SHA-1: 7a5d0368a5b95fcc78736233df5d90033e685c22 SHA-256: dbf7cbabb6732beb92a08c5787a6e834c6063eaabb8f99dcc3cee5b66298eb26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cserepakcio.hu/xdata/file/lejipetomemetig.pdf In PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/tomopimoxiv.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/nixexapo.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/49312737220.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/gesiwizowup.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/jabokirenare.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/98193631163.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c48e95bc8---89231784012.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5439659938.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/61634219849.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/vibilefamavijegavukuzo.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/sasimamopudaposudusa.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/69083433775.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/39824199470.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/47642544301.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/84505562682.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/xaxarimewovapan.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/69603934120.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/bopidisifineg.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/vudisofazo.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/10032110205.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/pivufow.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/xoxagajokejadaguneku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=whack+your+teacher+games+onlinePDF 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_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 10976 bytes
SHA-256: 7ff58d28b186875123f82db2625d87e11003478d397cf336559613e33278bfdd
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 17384 bytes
SHA-256: 50bdf5e7b414d59b986fb5c2303dddd2e997f5655701d24ba211090f6bfee3f7

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