Malicious PDF — malware analysis report

Static analysis result for SHA-256 636c30247b9446df…

MALICIOUS

PDF

73.7 KB Created: 2021-02-19 20:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 99e26da7122c0e54fbda8d78b0e89bfa SHA-1: eac896f6f35928a8fd6ae52b138ed22a46fd9f63 SHA-256: 636c30247b9446dfd2098bc43bfce8487f2a465be2370d5292aa3985eb134d59
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection for phishing and trojan activity. The embedded URL points to a domain that appears to be part of a phishing campaign, likely attempting to trick users into visiting a malicious site by impersonating a subpoena compliance notice. No scripts were extracted, but the PDF structure and external links suggest a phishing 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://jacksth.ru/wix?keyword=wex+inc+subpoena+compliance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489740/normal_6016fc89f3123.pdfIn PDF document text
    • http://strgb2.ru/20999875566xbvjz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420903/normal_5feaf9591adce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_600659ed8dc30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5ff1b78c3793a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474739/normal_60094bce7f055.pdfIn PDF document text
    • http://rimisirotox.iblogger.org/american_pie_8_fzmovies.pdfIn PDF document text
    • http://milanbeachs.space/road_trip_travel_planner_freesvnuo.pdfIn PDF document text
    • http://love-your-lips.online/juweguxokojatafilowomurov1cpnk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_601bafb70a533.pdfIn PDF document text
    • http://rabota-plus.club/59792976268rt4gd.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/metubevozisul/we_are_hiring_template_free.pdfIn PDF document text
    • http://bezegorev.epizy.com/chuchuma_rayvanny_video.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_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 5204 bytes
SHA-256: 41a24907c78cfb13ad22a951184a2ab2393bd3d95140dbddbd8d9a01cd8504f1
font_01_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 10492 bytes
SHA-256: d10ebf5f6f3b6d190f3ee195b6617cdb2e75249d79383f225a860941c9e966df

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