Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd7ac9d39b88320…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 02:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b019a82b8b41b61d81efedb36809c18 SHA-1: 462f47663491f71c5702dbf57cc812fd34569b9e SHA-256: 2fd7ac9d39b883205b10f68c4380cb0eaa2afa72319ec88bdf573a5ee03601e9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to disposable domains. This suggests an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://grafosaleservice.cz/images/fck_editor/file/88712853856.pdf In PDF document text
    • https://burlingame.com/wysiwygfiles/file/40239472949.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/64166766823.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/pusetomofediludof.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/3554755556.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/sulogumosavuzinedegifaki.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/kewixezeramotesasewo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/08a249d7994e76e7c578ef39195482be/wutubezuwotobupexe.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/gaxisigobugowufapulofek.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/18720310111.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/28239873253.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/90064425224.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/jaruduxuvax.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/jixixodilexuremupiwawo.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/waxodapunagiziwokaje.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/kipubodo.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/53312747661.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/ziwusamobulot.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/30539343564.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/galesuxasora.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/26940813247.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/kunedut.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a87acbf5b036199293a86f1078d03d0f/80500952386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=horror+games+android+apkPDF 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_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 16876 bytes
SHA-256: ee7f05d943a2a94f6d65be05bd97bd42f5a17b9ed08712152a711ed06f37f3ca
font_01_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 10672 bytes
SHA-256: 065be86b4cae67948d297fbaedcdff027534507ee64085296d5e464bf9edb71b

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