Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e37016991885908…

MALICIOUS

PDF

83.2 KB Created: 2021-09-19 02:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7282455fc625b21282cb930bf068366e SHA-1: 79d272ace0e7de69662893619f3f66d74bc07243 SHA-256: 3e370169918859080254a9ebd0d11fab44abfb0a603523ee4b9b2211e71dcecd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains a large number of external URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://constantcontinuity.com/membership/data/files/dumilumilibajole.pdf In PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/99018981412.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/31198332515.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16313422988312.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356c7fc045c---29069470403.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/66350436254.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/nufufenedegiz.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/leratanoxolowu.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/91316181613.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/lewosebem.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/rifeboxulolekodog.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/5648270416.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/80464576705.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/tegupetunetoj.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/27428649137.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/kujasamukakorene.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/pemidukojipexuxes.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/25604964313.pdfIn PDF document text
    • https://nasikampung.info/contents/files/goramuvakebavelomuninifa.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/maropo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/85753002015.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/wekud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=audio+capture+in+androidPDF 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_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 10376 bytes
SHA-256: 389804e6712ef87e38f39bd69b952f68a9490975419d15b5c1c3778daaa8ca42
font_01_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 18720 bytes
SHA-256: 3e76479ffd9f2c3a3a8b2b9d3ec4f638d389881bd1f7a1c7713497f50a4c8d17
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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