Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c7733503f5ae74…

MALICIOUS

PDF

86.7 KB Created: 2021-03-04 12:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 136edcf10a86ff4f4a101b98201778b1 SHA-1: 07f7d4395d9f477e2c78b977c64a762f338f9f3f SHA-256: b7c7733503f5ae745f33d5244f909768bec9b3dea34ab0e7fe1029fdb547beec
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/123?utm_term=baofeng+uv+5r+plus+scan+mode PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459628/normal_60143cbcb35f1.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/how_to_fix_proform_elliptical.pdfIn PDF document text
    • https://nexirexosevexos.weebly.com/uploads/1/3/4/5/134500935/a2fa8da2239f4.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/what_are_curriculum_areas_for_preschool.pdfIn PDF document text
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/ad2065ddf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fe16557d5b76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5fe8d4e123b0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492555/normal_602bb47152910.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/cX4RjaY/nekuwetenuxexamisaxubaso.pdfIn PDF document text
    • https://cdn.sqhk.co/tanusulirava/ha1ig7m/nora_fatehi_songs_list_mp3_download.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/3342045.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/how_do_i_fix_my_e18_bosch_washing_machine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393883/normal_5fe4fe940e490.pdfIn PDF document text
    • http://waduresiwiboba.iblogger.org/jadebunotalupedeg.pdfIn PDF document text
    • https://kemodiduwe.weebly.com/uploads/1/3/4/2/134235489/6088080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413457/normal_60065ce37a7f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sozidasagekixur.epizy.com/92727544128.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/40438645508.pdfIn PDF document text
    • http://feferabi.atwebpages.com/second_grade_printable_money_worksheets_2nd_grade.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_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 5708 bytes
SHA-256: cda5b354bb6dee634544edffa0584c14d38b2280122e7c4a7d3826ceb7bfae98
font_01_sfnt_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 10528 bytes
SHA-256: 563a52c061b166d3db5c91a53eddb6fba7be5065a695f23ee9005f0a176a1886

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