Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d4f5f4078a23d1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 03:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 70db5df7b534982a932111ea85f1d1f1 SHA-1: 8799abc548bade53be1245976bc61cf814cc85aa SHA-256: 44d4f5f4078a23d110499cf04defeed10555fd41eca59cb88881df63afedd693
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://penzionnakrizankach.cz/ckfinder/userfiles/files/ferofozugijotevufej.pdf In PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/vidukesukodisunop.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109040614316993117nmbi0.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/weluwedosanilo.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/vazewujepoxo.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/sowunuwejijowibizofalu.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/72477115977.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/raxakewakejodutodilato.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/58960176405.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/vumolinuleti.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/55760927926.pdfIn PDF document text
    • http://risme.vn/files/xupuzutesowomiz.pdfIn PDF document text
    • http://z500.si/files/81638672900.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/12583990766.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/21335900774.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/pufupojaxifedapiz.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jolediwevobofarabuk.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/milolagarasilonerusogawe.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/2494843009.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/96402318972.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/62714264681.pdfIn PDF document text
    • https://megashina24.ru/files/files/dojedizalug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=using+android+terminal+emulatorPDF 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_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 10700 bytes
SHA-256: 5cb660ce7e5f85fd4d0e4fc1ff2555ec22a062aa637ef7b84f223802167d224f
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 18444 bytes
SHA-256: c79f9829c7d87abdd7792b1423d7cdf976bba6bb66441f25e13338f5364dcef5
font_02_sfnt_off00013296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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