Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35ea9c0696def32…

MALICIOUS

PDF

82.3 KB Created: 2021-03-02 19:20:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: bca6aa2e752c0622e267345211f236e0 SHA-1: addef6d5498eb53da68037d9f9e27b66bc5fc534 SHA-256: c35ea9c0696def326ad8c7b67abb061e5cfeafe1caa1ff313ba278d60ebae581
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, specifically as a phishing trojan. It contains numerous external URIs, with one prominent URL pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The PDF's structure and the presence of embedded links indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=flight+of+the+bumblebee+guitar+speed+record PDF link annotation
    • http://profapp.pro/lobefasuxonagukedu6pj54.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/hziGia5/free_iphone_barcode_scanner_to_excel.pdfIn PDF document text
    • http://micrometer25bill.site/inverse_converse_contrapositive_worksheet3gas3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388629/normal_5fcc2d8291137.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/h6mAGtM/jodilijesipogopisa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5ffac87824ac4.pdfIn PDF document text
    • http://espaceclient-cmb.com/plantronics_backbeat_fit_6100_reviewsnshgo.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/igMghgf/download_skin_editor_3d_for_minecraft_pe_apk.pdfIn PDF document text
    • http://trellos.fun/zabipaby8u5g.pdfIn PDF document text
    • http://premiumpornclips.com/bartonella_bacilliformis_prevencionyadgr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_601d4bba086bb.pdfIn PDF document text
    • http://weareanonymous.org/bose_901_series_v_reviewcqb98.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/h4rJYi3/96742956193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://juzomebudapok.epizy.com/aggiornamento_android_9_samsung_a6_2018.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
    • 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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 5664 bytes
SHA-256: 1ec515137fbb38ff310bedf8425c9f60a1d1cf85a8b02aaf6a58d3f3c6eaa897
font_01_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10268 bytes
SHA-256: 77e9f13971c1d692de0c84e29e50f7fc5397304a8eae90d6d55c8cda183364c9
font_02_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939

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