Malicious PDF — malware analysis report

Static analysis result for SHA-256 347b9f78f048e03f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 04:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbe996626021e2642c87bbc48ac82f82 SHA-1: 3897043b2ab722a420c3d67813b0910dff1d2c28 SHA-256: 347b9f78f048e03fd0f065e1efe068e37913405dfaefeb2bd6bef38c6928154a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It also contains a large number of external URIs, many of which point to potentially disposable domains, indicating a link farm or phishing attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://baltyk.recykling-rejs.pl/imgturysta/files/2427870267.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/48571641234.pdf
    • http://gyuco.com/uploadfile/files/20210901_151128.pdf
    • http://loscogliodifavignana.it/userfiles/files/dasejotogixerajane.pdf
    • https://suadienlanhhanoi.net/upload/files/41574780012.pdf
    • http://crestviewshopping.abwingsmd.com/uploads/files/wezet.pdf
    • https://fsbulletsandbrass.com/userfiles/files/ferivosovosazaxo.pdf
    • http://acevina.com/webroot/img/files/35867051451.pdf
    • http://chengzechem.com/upload/files/kefaguratilurirulunanol.pdf
    • http://papianiarch.it/userfiles/files/bejufamukofosor.pdf
    • http://isotope3.pm-ural.com/uploads/files/84701130946.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/6818675581.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d2f526b5b---digufupawewem.pdf
    • https://aimhc.com/userfiles/file/besadera.pdf
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109230727537160.pdf
    • http://shanghaiqingchen.com/upload/files/69982990928.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/wasujibu.pdf
    • http://www.mattig-accounting.bg/fisiere/file/lemibupiperalo.pdf
    • http://meimagedance.tw/ufiles/files/56073738751.pdf
    • http://motopujcovnateplice.cz/userfiles/file/97886739471.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95180385413.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d2a2cfe6---43237405191.pdf
    • http://rjt1.org/upload/files/mibapulaxoziz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=trainer+halo+the+master+chief+collection
    • 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_off0000af2e.bin
2713c72f7a7fd4fe2d7a635762d22f32d72d91e378dc8d35bf0c7dadc762262c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2E 16468 bytes
font_01_sfnt_off0000d994.bin
65008fceac571978ccf7115d47f934a98324bd91db49ec156edcf4bce342a49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10564 bytes
font_02_sfnt_off0000f171.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes

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