Malicious PDF — malware analysis report

Static analysis result for SHA-256 765ac0977d88564e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 21:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4cf57131bcd2e44d7ae025364e8013b8 SHA-1: 338b1ef68b9e3b18cfae8c2f1daf5b06085cea57 SHA-256: 765ac0977d88564e242649de4cb9821a4b9e496343f3e1d427f6e5716cc5a625
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://synerhu.ru/uplcv?utm_term=android+market+charges PDF link annotation
    • http://muasamhangmy.com/ckfinder/userfiles/files/vafufavisolisalu.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/mixilibodaro.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de960ff4a---buvidexafupirejisi.pdfIn PDF document text
    • http://msiutilities.biz/documents/jaxumuvonawar.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/taxagilunurojaxazudu.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/vusimogizox.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/zelomupemupav.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/14859839434.pdfIn PDF document text
    • http://anpo.vn/upload/files/nivubomajelafa.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/jujumemupazazepaw.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7b3a81660---21406165428.pdfIn PDF document text
    • http://labotinnghia.com/img/files/408836073.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/fixaguxupuwiwodipuma.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/wugomalefek.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/poviginemi.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/32183382326.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/mosekuro.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/gelezudaribitarukelidomo.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/51526443302.pdfIn PDF document text
    • https://kalafiber.com/webroot/js/ckfinder/userfiles/files/migunomudi.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/bopavekakas.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/wobafowovidedoweluf.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/remukamoxagujojefejuzax.pdfIn PDF document text
    • http://skisun.it/userfiles/files/14117220677.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_off0000afac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAC 15764 bytes
SHA-256: 9a9f71f21a88ea511a1696bcd7354d41819a0fc7a1a0de8002cfc41143dd7072
font_01_sfnt_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 10844 bytes
SHA-256: f0182bff95c03d23f68eacd9f924e85880d9f83244b82f670e16b069da6b66b5
font_02_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1