Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fefd1fd90eb8752…

MALICIOUS

PDF

73.3 KB Created: 2021-10-01 00:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00397e7a2e73587e1ef0aa4a78185068 SHA-1: 8ec17dfad226639e399009b2dadc49421ea6fa98 SHA-256: 0fefd1fd90eb8752687c97197293a2bf8f28910390dcacfa92b732f079d42a61
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with specific detections for phishing and trojan activity. It contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious sites. The presence of embedded JavaScript (T1059.007) suggests it's designed to execute malicious code or facilitate further compromise, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=skyrim+main+quest+line+order PDF link annotation
    • http://stylowa-pss.pl/userfiles/file/kutesozubekajew.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/58205008152.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/wewamelawudifafe.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/67809291255.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/13031262939.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210918_418A77A662914984.pdfIn PDF document text
    • http://hongdacable.com/d/files/66896983462.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/milijaxevuxebaw.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/352380214.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/51720192659.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/galozunuzu.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/jaful.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/baxekanomofumaganubo.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/36989027568.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/28660634852.pdfIn PDF document text
    • http://hingliltd.com/userfiles/76509866458.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3e8eb9e3a---vaxepiruxixunefipu.pdfIn PDF document text
    • http://greenld.com/userfiles/xadatufeparonibededemulil.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/72877641334.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/6360515353.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/63872545774.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/23219410151.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/fekubata.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_off0000b4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD05 19212 bytes
SHA-256: 1ac348e4f59e903b73516176cc85eab485ff780169ea66b610d8ea24ba92de12
font_02_sfnt_off0000fe89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE89 10936 bytes
SHA-256: 3c0b7fb9abde917d962a456581b6d2cb834f53a22c4e835a96b289234c924f30

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