Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad66d3e96b40cfb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 03:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8668dc68462b74b234cd1e1976bec368 SHA-1: 8a5ce1daa25e439a4bc6171304511f6b8c3c7102 SHA-256: 6ad66d3e96b40cfb521d7cda5896befaf1e77c14f10a1b6f830fffebd77eb05e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. This script likely redirects the user to external URLs, such as the identified `https://crysiq.ru/uplcv?utm_term=car+simulator+2+mod+apk+all+cars+unlocked`, potentially for phishing or to download further malware. The heuristic firings and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=car+simulator+2+mod+apk+all+cars+unlocked PDF link annotation
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/jopizikipiwenabewebebefaj.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/vetagozizake.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210907163101234642.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/89334560836.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_122358_4863.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea11d204b7---jexefanufe.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/6719817248.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/4270344522.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/sezedib.pdfIn PDF document text
    • http://www.og2c.com/images/file/maxosejox.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/woted.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/dofekokavimexorasalavuli.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/monotovozezigekirikif.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/sarelebakokonorosakemat.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161467252f23d0---xexovugusubudav.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/doxujodatexutanibarevubit.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/nidedewirujikuvisanasijil.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/14318813964.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/8285903192.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/44511433148.pdfIn PDF document text
    • https://aashianarealty.com/file/28992888035.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/84405332866.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/fodosalegijoxogevoxurug.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/95044478128.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/77432922561.pdfIn PDF document text
    • 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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 17616 bytes
SHA-256: 5fb709279feb26aec87b3289f53eeaa647822161fbc1d003d28d94b37370dc18
font_02_sfnt_off00012476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12476 11016 bytes
SHA-256: fb7afc081924b27afb0137a48d4fe9fe8a5661c6325d99c87e823b96f1a97f1e