Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4ebc6b4954394b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-19 23:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 737e18fe20291f83ed4ccf2f06e5d59f SHA-1: e99c2d0b4384c501889904a1e5fcbe54263d4f9a SHA-256: 9c4ebc6b4954394baa6b22456ec1a202cc6b1161863adfaec12fa53bf0097d00
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 distributing further malware. The presence of embedded JavaScript (T1059.007) is a common technique in malicious PDFs to initiate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=sdk+tools+apk PDF link annotation
    • http://namhungholdings.com/uploads/ckfinder/files/pijop.pdfIn PDF document text
    • http://surtek.biz/image/files/20150317_185509.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/30406509171.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/tezojoxilabajipir.pdfIn PDF document text
    • http://vo23.ru/upload/file/diduju.pdfIn PDF document text
    • https://masukpt1.com/contents/files/7942931170.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/milobiduxug.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/26324487935.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/pajibefofulobufemugi.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/zegizavirawoxexejadame.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/jukaxoxevilitugizokefixe.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/64524354404.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/2661455572.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/19674402598.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/60750024043.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/86085999153.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/21815006403.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/81171485046.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/99169928295.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/xububaxomugar.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/vokegopimokomutebesugere.pdfIn PDF document text
    • https://renewone.de/files/libabigepozegivologadoxu.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/wafuzegazinedilebasa.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/42729860793.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_off0000c07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07F 10124 bytes
SHA-256: 2104aa106ca3532309926aefeb7a964fa1769f6fc2e8e7e31bbfb18061cdcde1
font_01_sfnt_off0000d73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 16796 bytes
SHA-256: 5936295b681a5fd2565fcb3498e23d79e423a9734b1a4d401275402dc56c7d6a
font_02_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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