Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ee8703fffdccfc…

MALICIOUS

PDF

75.3 KB Created: 2021-02-23 21:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3ad33ed1d298346e4cd109c4aa8d61e1 SHA-1: 809a49e98b0b86da2e01b909ef3471e517375598 SHA-256: 12ee8703fffdccfc6941ed2ffb0a55f9b1aaaa4bb7dacbdac58d64250480a605
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/123?utm_term=academic+writing+skills+3+student%2527s+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5fc70cd7c1534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_5fd09e459d328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376372/normal_60107531e82c0.pdfIn PDF document text
    • http://best-ital.fun/kunupegazolukukakosilcgyy.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/y7GhcW2/96259938534.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/QgivBid/xetejadupane.pdfIn PDF document text
    • http://tularobumof.66ghz.com/86490224162.pdfIn PDF document text
    • http://trokot-roznica.xyz/zaxujofozovivowoz5v4ha.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/mAC7yib/26739560742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5ffe171d3dce8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478127/normal_5ff28b4932f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_6021fa10ad767.pdfIn PDF document text
    • http://zesabekuziwuga.iblogger.org/matudoxodev.pdfIn PDF document text
    • http://januvasiw.22web.org/identity_theft_police_report_dallas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_6027df9caa218.pdfIn PDF document text
    • http://cookwellbakewell.com/94559668197ex96h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vepasojus.epizy.com/quote_from_uglies.pdfIn PDF document text
    • http://warunegiluj.rf.gd/company_name_change_letter_template.pdfIn PDF document text
    • http://weketabafizevu.epizy.com/shimano_alfine_8_speed_service_manual.pdfIn PDF document text
    • http://dumoripusino.epizy.com/mexelakelugujodipif.pdfIn PDF document text
    • http://merawaboz.epizy.com/verumamigixamovis.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_off0000e9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E1 5740 bytes
SHA-256: 89e61a92c9621b6595da338bb978bf33c26e5e676632e0a862d31c6cdda6c1fc
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 9868 bytes
SHA-256: 1a21634664f22a12935571d0dc651193f53ec7e1a747e2443b6a0c5ae7595c5b

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