Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d80280e2533118…

MALICIOUS

PDF

90.0 KB Created: 2021-09-21 10:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99139632a8e9f8a3536e2675f7a73b65 SHA-1: dba35ae2109d9236354c31c33ae70dffa6af74d2 SHA-256: c0d80280e2533118ebcf562e8c201391b5f34fbb3b3a922602fdebfcaf868c58
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. ClamAV and ML classifiers identify this as a phishing or malicious PDF. The embedded JavaScript likely facilitates the redirection to these malicious links, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://studiosimonepantaleo.it/userfiles/files/jedeled.pdf
    • https://cmoretv.com/userfiles/fufedagomox.pdf
    • http://jullien38.com/ressource/site-image/files/fubizedasew.pdf
    • http://lycee-elm.org/userfiles/file/gogeruxede.pdf
    • http://dagmare.de/userfiles/file/wudevijazob.pdf
    • http://phutunggiahungoto.com/uploads/files/kizotujamobuwa.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/40957764154.pdf
    • http://radecznica.pl/userfiles/file/mibuzotupuvat.pdf
    • http://albino-pitti.com/pub_img/file/didobeluzo.pdf
    • http://zabbeleecooking.com/ckfinder/userfiles/files/30779457937.pdf
    • https://cooperadora.grupocreartel.com/documentos/archivos/95710966302.pdf
    • http://antropolog.ru/userfiles/file/mofajelatexewexalolalax.pdf
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/bamonuturefawunasa.pdf
    • http://freewest.at/53233805770.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/xiwirifida.pdf
    • http://saga.diamonds/uploads/ckfinder/files/fujafig.pdf
    • http://tcsm62.org/uploads/news/file/15198973222.pdf
    • http://whitedwarf.ru/public/images/ckfinder/files/7110621842.pdf
    • http://tootingtaxi.com/survey/userfiles/files/89454314818.pdf
    • http://halongwave.com/userfiles/file/lomofakenonatewo.pdf
    • http://naoshima-habitant.com/images/blog/file/fevujipo.pdf
    • http://bjdfszwy.com/filespath/files/20210917154753.pdf
    • http://motoren-adachi.com/js/upload/files/lufuvodibefilurewa.pdf
    • http://myconnect-thailand.com/image/upload/File/zonubizosepiwivas.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+studio+debuggable+true
    • 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_off0000fa68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA68 16792 bytes
font_01_sfnt_off0001127f.bin
df43bebe52eef6354e000217b39678238bb3af568c6357a82cfd5089406f2a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 10644 bytes
font_02_sfnt_off00012acb.bin
539d77af00f1b17ec70f04c17aef885cc3d5973bf01f23e4364156ff2e0a1e5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 18008 bytes

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