Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4608b209c935cc5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 07:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40306426e6e26d60d77a20bac9b12c5e SHA-1: 953118aac13820ff7b8cae599d03e00b0ec43c5f SHA-256: f4608b209c935cc5dc6e294858791f2d3497ae621acfafa58b4ce752bd6417d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. The presence of embedded JavaScript and a large number of external URLs suggests the document is part of a phishing or malware distribution scheme. The primary function appears to be directing users to potentially malicious content or downloads.

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=best+game+on+android+2014 PDF link annotation
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/weramubepotuwujonesepo.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/86185931160.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/50849302242.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/87223576724.pdfIn PDF document text
    • http://104408017.linker.tw/files/zududepirebakumemoduduvoz.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/77500342030.pdfIn PDF document text
    • https://egf.tw/test2/images/file/vefetujagawivi.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/54689031794.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/pirojusafinatanosoxomupi.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/81353464119.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/zemejokir.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630629016/files/kovoladezasurig.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/91137698116.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/zogesutuxuwetu.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/74696414728.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/zatojizozes.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/75443232226.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613363dc53f50---10437568242.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/48714050404.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/50843743638.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210916072525_0rt2i1.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/16227710685.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/xedorelonexot.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_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 17404 bytes
SHA-256: 582b42766f9ffc2fde446d12720e23c0acb05fae504e8992d9a64272b144ac06
font_01_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13287 10972 bytes
SHA-256: f65a01bce753778b88a768b804b4ad5d4821ee3b9f714b6de7577cde9d3d036c

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