Malicious PDF — malware analysis report

Static analysis result for SHA-256 b182e0e846e9507b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 03:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 740bbb6d49048da97e0204e322bde664 SHA-1: f5bcdff98dc75d2813365045f94b39e9093e0746 SHA-256: b182e0e846e9507b1f3182a143c45893d4fabeb6a6c170a5a3f731978d1eeb09
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, with the sample being identified as a phishing trojan. The embedded JavaScript likely facilitates the redirection to the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=best+grammar+checker+app+for+android
    • http://badgerhillfarm.uk/vefaxamuferisalufemineke.pdf
    • http://cuathepvangohaiduong.com/images/ckeditor/files/70667885769.pdf
    • http://stefanourso.com/public/userfiles/file/bepewipezatizogafipun.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/4bb30a27ceef5cdf2fea2d016d0bfbab/81926556387.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/10096059801.pdf
    • https://nepalmicrofinancesummit.org/userfiles/files/pazen.pdf
    • http://biogenetec.tw/image/files/20210901_071558.pdf
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/fogosenavinelategugis.pdf
    • https://raghuvirtrading.com/userfiles/file/wovigoj.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136896c22cac---gujamikilisumugajetivodeb.pdf
    • https://promoform.coreform.it/uploads/file/89237004336.pdf
    • https://e-ssuances.com/ckfinder/userfiles/files/visamejewilujazimosu.pdf
    • https://vespaclubcagliari.com/userfiles/file/63215634110.pdf
    • http://sonarkella.com/userfiles/file/vorubozizikipubonaj.pdf
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/lubigegipofugev.pdf
    • http://leoclubmarsala.it/userfiles/files/welufurosexutufe.pdf
    • http://beastyenergy.com/userfiles/file/puretodutiwidunigaziwuvel.pdf
    • https://namhunglogistic.vn/site/files/41858959705.pdf
    • https://mama-light.net/business_school/uploads/file/26732134092.pdf
    • https://mavachhaiphong.com/upload/files/gepopazegav.pdf
    • http://ahjygjg.com/upload_fck/file/2021-9-23/20210923042949362929.pdf
    • http://hnkingdee.cn/Files/file/2021913191455.pdf
    • https://profm.hu/files/file/boxemikesoneteveli.pdf
    • http://nguoiquangphianam.com/uploads/files/pirijazimixide.pdf
    • http://huabulaw.com/uploadpic/2021-9/file/2021092301530073499.pdf
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/jobamikatimenepamitat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b487.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB487 16792 bytes
font_01_sfnt_off0000cc9e.bin
da328265d018de7fdfcbba40fba86d682819c78e0a8357935dc46be820eb79e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 11164 bytes
font_02_sfnt_off0000e663.bin
3e37a54438def3287a66f1e41c10cdafcad2bb41dcd5f32dfe2b0987237a21b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 15672 bytes

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