Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49d6eb31169ccf8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 15:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5e3bd4d9356a5eb28734af05b6739a4 SHA-1: 973db2361da6a914a136870441e115288df46602 SHA-256: c49d6eb31169ccf808973c71f23ae499f874dccb2d5a96c212b2bab1f97bf95d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to exploit vulnerabilities or lure users into downloading further malicious content. The presence of embedded JavaScript points to its use in exploiting PDF reader vulnerabilities for initial execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://wastran.ru/uplcv?utm_term=run+66+unblocked PDF link annotation
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/235525460.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/jonatukupoz.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/49593482796.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/35812104146.pdfIn PDF document text
    • http://gibisch.info/files/files/vuminobesovatu.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/84247469456.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137df0d98f04---10705659524.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/87840567626.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/kipowudaxujagadibodivoxi.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/bowulegixefewavuziwanezis.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/xutesabaf.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/71490993551.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/jejowesitogadaxote.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/75276815771.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210904163078761061.pdfIn PDF document text
    • http://soles2walk.cz/data/file/90427058441.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/52868234398.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/157dbf9ef1cc41bdeafb4a0599044efb/65550245246.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/pemakozoxok.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/3088843322.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/46016809722.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/2799238779.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/59045769087.pdfIn PDF document text
    • https://ka-base.no/images_content/file/ledajugotizabisaxapiju.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908032244324119.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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 17972 bytes
SHA-256: bf2153ce3fc16180fc9485813398e031af0a007f6a15257a5249d0f850f2bee0
font_02_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 10288 bytes
SHA-256: fed799252b612a4f7b2e3248c4b1941ed19e4c89b685eb3608ceee3d9e011df9