Malicious PDF — malware analysis report

Static analysis result for SHA-256 428fa6175c927b28…

MALICIOUS

PDF

87.8 KB Created: 2021-03-25 11:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9147f02570b9692ba8968473b5460d91 SHA-1: 1f3805b771f6d40e0d169fa79c66ae47e5a7ef60 SHA-256: 428fa6175c927b2859b04a7371a794ff4d28604353904c94d9e9b9313a85fd48
186 Risk Score

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/123?utm_term=abu+dhabi+airport+arrival+information PDF link annotation
    • https://fuxuwalanad.weebly.com/uploads/1/3/4/4/134487417/kidugopet.pdfIn PDF document text
    • http://zopesozali.mypressonline.com/cours_sur_energie_renouvelable.pdfIn PDF document text
    • https://rakuwogu.weebly.com/uploads/1/3/4/8/134858672/pexepan.pdfIn PDF document text
    • http://kamefutebiwef.mywebcommunity.org/mic_not_working_on_laptop_zoom.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/best_short_stories_for_high_school_from_other_countries.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/mapa_turistico_algarve.pdfIn PDF document text
    • http://nozumupi.medianewsonline.com/surah_yaseen_malayalam_download.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/el_conde_lucanor_vicens_vives_clasicos_adaptados_gratis.pdfIn PDF document text
    • https://japugaze.weebly.com/uploads/1/3/5/2/135295186/8241162.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/fosipefoxideguwakiteloso.pdfIn PDF document text
    • https://dolumipekino.weebly.com/uploads/1/3/4/6/134625527/3092613.pdfIn PDF document text
    • http://mixutadumekaje.mypressonline.com/6893866265.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/8856314071.pdfIn PDF document text
    • http://jogajep.medianewsonline.com/android_os_versions_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_6ad673fafb734e8385e25d61a812c3de.pdf?index=trueIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/4778287598.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_5326634e7d734f8abf9c5b53e68045d7.pdf?index=trueIn PDF document text
    • https://03aaa7dd-6608-466c-a68c-f41c59811c05.filesusr.com/ugd/ae15ca_f10c43b72d7749cf9fa6e7817d503ee4.pdf?index=trueIn PDF document text
    • http://fuwutowamig.myartsonline.com/18306989678.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 5292 bytes
SHA-256: 1927456e048874e501de6cd19e7688e3119af5048fd8616417dd8244bec59f99
font_01_sfnt_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 11364 bytes
SHA-256: f72c43a5f6a51c70b7e7df54a2e530642a8af771130f9e925a3e177ad1f8e47d

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