Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecfb9ceb12c7478…

MALICIOUS

PDF

74.6 KB Created: 2021-03-01 11:37:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 96cc664668d9302119213676da8fe943 SHA-1: 0f29e1e105c6d34ed4958f3202a07a47c1dd5adf SHA-256: 4ecfb9ceb12c74789fb3f2c3970832298a5e08a403dd0f25bdcc2f2f2835c1fc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious content.

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/award?keyword=falkenstein+castle+texas+wedding PDF link annotation
    • http://graatorama.fun/reversed_carnot_cycle_pv_diagramk4do2.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/chgiaqe/24103484840.pdfIn PDF document text
    • http://didazema.mypressonline.com/66910196780.pdfIn PDF document text
    • http://lastmarkt.ru/the_tiger_hunter_cast1ak9h.pdfIn PDF document text
    • http://mamajan.space/papunuloxugezulbuds7.pdfIn PDF document text
    • http://abzac.me/gogeno7rfk2.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/hfmQ5jb/download_ultimate_life_simulator_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedilejom.myartsonline.com/joselimasikovoz.pdfIn PDF document text
    • http://setebuvoterir.rf.gd/australian_separation_agreement_template.pdfIn PDF document text
    • http://doroxokile.epizy.com/11278129129.pdfIn PDF document text
    • http://mipusefifiwud.epizy.com/jijapedofofitafi.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/6781967039.pdfIn PDF document text
    • http://firuwasuwubo.epizy.com/makusenovafoxorolezivufeb.pdfIn PDF document text
    • http://kirigawegugava.epizy.com/51672094466.pdfIn PDF document text
    • http://tososite.onlinewebshop.net/craftsman_torque_wrench_owners_manual.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/sedifujovotexu.pdfIn PDF document text
    • http://nunelaxe.epizy.com/nasasexej.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_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 5188 bytes
SHA-256: afbc81c8f4e5b8cf7a3b7d9b8a1dc6210e0f053596fd8bcebec2cb15086623c3
font_01_sfnt_off0000f74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74B 11148 bytes
SHA-256: 4134421d9be326a465f665b37a2f6f5d170f402b762fd765c01f205706c36cd6

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