Malicious PDF — malware analysis report

Static analysis result for SHA-256 965e15ae83a04792…

MALICIOUS

PDF

102.2 KB Created: 2021-02-26 16:14:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b14e24950624a30c33190cc74b829adb SHA-1: 3118312fb38bdbc11263e9afbd1a2873cd8e2551 SHA-256: 965e15ae83a047920436f519effde7ed54b76e83e46aaf254db865818b9a6147
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a potential phishing/malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=the+nicomachean+ethics+quotes PDF link annotation
    • http://reduslim-ordina.site/ligeboboziriforigk6ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_60279465c1077.pdfIn PDF document text
    • http://amsidgi.xyz/b5l7y.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/33315581525.pdfIn PDF document text
    • http://xakujuseboxomov.iblogger.org/5997678051.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/nowalofuw.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/powifemudu.pdfIn PDF document text
    • http://varistop.site/sony_a5100_manual_focus_assist849dc.pdfIn PDF document text
    • http://hookup157.site/jipitaxmwoi5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_5fda7994ea303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414334/normal_5fcd2f96a5cfc.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/figidireki/bomolimibalenozo.pdfIn PDF document text
    • http://xorabaza.rf.gd/relative_pronouns_exercises_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/catalogo_sat_3._3.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/roxezi.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/dijezagunon.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/rajufisategefuwawebudelu.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016ce9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16CE9 19136 bytes
SHA-256: c3855d8b8f6e79717c6db397e4318f25833474a0e0a000d5a86f1b8d10977b89
font_00_sfnt_off000137c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C9 4988 bytes
SHA-256: 946eb2f1f0a4a26e17f96cab46788221bde65bd5669349c06583484690808d76
font_01_sfnt_off0001489d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489D 10596 bytes
SHA-256: 77b1c40ba6edc14d32f4b0821569cb5b3b1b4ddcb61dfa583ccd2549a2736b59

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