Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea24c2c93e57309b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 05:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd6cc77ecdcedd14f9f19b3ddb8798a4 SHA-1: c39f98b0203fa3c839cef0fb69fd60a9cab7883a SHA-256: ea24c2c93e57309bbf264ac82748c1d792d9c32d7454bdcf480f6557554d2603
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute malicious code. It also includes numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://weighlessthisyear.com/ckfinder/userfiles/files/dodezokuxixuxapidekokuw.pdf In PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/60865706862.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/befekititig.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/96208179236.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/28516763016.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/bopilinopogaxaz.pdfIn PDF document text
    • https://rais.bg/uploads/file/22233226952.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/90457779743.pdfIn PDF document text
    • http://asfalon.com/__files/file/17468333952.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/lerinojivimomitaxuzeteva.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/tolesopisofogelanu.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/41065256040.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/88081007690.pdfIn PDF document text
    • https://mlspoland.co/files/file/jojineso.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/wozuwojegawopo.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/13358429601.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/fezajumatolemovo.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/10727064313.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/wajogapinirazorar.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/75894805663.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/9247214974.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/bekemexuraragusu.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/73597851640.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161438111730e0---xujibevogomorarosiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=castle+crush+hack+2020PDF link annotation
    • 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_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 10476 bytes
SHA-256: 0702e661674bc8b2058b026851d20b29e4db3f19dc42999115ef843a41f8ed44
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 19124 bytes
SHA-256: fffcc5cc3b2a929b4b78c6577935a991239d94c5a84157acfd75d6a444ab3dd5

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