Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf854522c0a97e7…

MALICIOUS

PDF

72.7 KB Created: 2021-02-18 07:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1c8a3e06918543d41d0e598698d54408 SHA-1: da2868654fe88adcdfb85ab99f9f00fd2d903b75 SHA-256: edf854522c0a97e75c804d66179c3d74dbc0ab792f9906e069a45733c1a737aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent link pointing to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/wix?keyword=iowa+city+summer+of+the+arts+friday+night+concert+series PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380219/normal_5fefc3d2750f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_600ecd8baff9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477626/normal_5fceda7ba8082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376850/normal_5ff5b5ddcbc2c.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/gfWgiCY/vuzapijadij.pdfIn PDF document text
    • http://dubulus.iblogger.org/femojupepudakilonijofol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469104/normal_602da9901ca72.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/dulim-bedubararigu-zizotev-winulasiloruzeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5fd95a8083a3e.pdfIn PDF document text
    • https://cdn.sqhk.co/jafakitiw/iigfvWp/pabiwanivizekaparox.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/gM7ihnT/galaxy_backgrounds_for_computers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lerezazo/nawoletotodu.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/adobe_fonts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/sebugurujutixovelunigodon.pdfIn PDF document text
    • http://vulomalizekuvu.rf.gd/21919335317.pdfIn PDF document text
    • http://dowirefe.rf.gd/booz_allen_hamilton_email_address_format.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 5532 bytes
SHA-256: 1d7d06a677bd1108e537f9de58773c91a249d4b5e8a2d4afe49880ffa3029ae5
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 10564 bytes
SHA-256: 92416e522d2fee90197e5db21c80073d12f801acdb56c1daf893d5cb6fd58310

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