Malicious PDF — malware analysis report

Static analysis result for SHA-256 18574746e81e0989…

MALICIOUS

PDF

85.7 KB Created: 2021-02-17 11:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ed7760ca1519d504249755ebc9cd4541 SHA-1: 0d0e2de317945f6bd076ad2b7fda842b5d7cb596 SHA-256: 18574746e81e0989aae80e2b2ac86b02c4dd6a78e90b1678d2fa3de816c60e75
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=childrens+dr+dr+jokes In PDF document text
    • https://static.s123-cdn-static.com/uploads/4423442/normal_5fcb194855769.pdfIn PDF document text
    • https://cdn.sqhk.co/wobivada/iijhbhf/joom._shopping_for_every_day_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/difueid/gegixerumoluva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5fcdc1e8a0c47.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/2pKxsaN/pagaxusaditiviwopaxexo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_6001eebec4cc6.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/aFhdI5H/women_s_world_cup_soccer_championships.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/iibhhAg/bogugabimoluvazagule.pdfIn PDF document text
    • https://cdn.sqhk.co/botikavanov/fghI8gj/zazuto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dogazuzi.epizy.com/33565931409.pdfIn PDF document text
    • http://mujevevurisul.epizy.com/76072953313.pdfIn PDF document text
    • http://dulibunaxojomo.rf.gd/linofuzelepowenedemosi.pdfIn PDF document text
    • http://bofiragomux.rf.gd/aankh_maare_song_pagalworld_simmba.pdfIn PDF document text
    • http://mimewimirul.rf.gd/baseball_uniform_designer.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/windows_update_blocker.pdfIn PDF document text
    • http://voxinuxo.epizy.com/photo_editing_background_image.pdfIn PDF document text
    • http://roteniju.rf.gd/first_birthday_chalkboard_invitation_template.pdfIn PDF document text
    • http://dekidad.epizy.com/32024086834.pdfIn PDF document text
    • http://vonupov.epizy.com/rifag.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_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 4748 bytes
SHA-256: 6bd8c72380c05ab3af84bb897373ea7ae2c6e274bd38f38e21f6ccc0cab5fd88
font_01_sfnt_off00012352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12352 10756 bytes
SHA-256: 33bd28afbe5b3ecf51da78572bfe443f3234caec3cf0e742f4b86d9b714f3d8a

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