Malicious PDF — malware analysis report

Static analysis result for SHA-256 657634b3f0378d6a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-19 06:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cdb4985cfde21da4d5101e0a931561d SHA-1: 12f0e8faa5594669bb0c16b57fd1223d8b4bf756 SHA-256: 657634b3f0378d6ae40d1bcd379ff512e3fea723fa2d68180e04f6e6f74e2246
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, indicating an attempt to download and execute a secondary payload or redirect the user to a phishing site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JS points to T1059.007, and the overall nature of the file suggests it was delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=korean+curse+sentences PDF link annotation
    • https://synersys.fr/contenu/file/17691301180.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/98638369350.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/sewugomonajuzap.pdfIn PDF document text
    • https://bloc-immo.com/images/wutumokid.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/paxededakab.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/79784527440.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/maxosumawo.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/14415208407.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/52438108818.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/pobaz.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/56357387138.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631926634.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/basugowenak.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109031624128764.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/tenakuzitar.pdfIn PDF document text
    • https://service-panev.com/userfiles/98625489433.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/67227539587.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/gafirol.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/lodejitogibo.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/63135875066.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/93085605317.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/14188937569.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_off0000acec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEC 17192 bytes
SHA-256: 39fa3e990272d0c5cdac0fd3785d296090e391ce15f9dcec8caf44f7bcd87afa
font_01_sfnt_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 10176 bytes
SHA-256: ce2b8ddb67fe1d38a34b0243214a0f00f65ec61462d44811f30f397ca114f7ce
font_02_sfnt_off0000f003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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