Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1038ce908a15ac1…

MALICIOUS

PDF

74.2 KB Created: 2021-03-28 13:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3189b623cb6cbebb1ca265b5bf665273 SHA-1: ce622ba6055a3eadf0b1cc6e3d9758f80fd3ad8c SHA-256: b1038ce908a15ac1823813e0a5425639ad26898bd707d9ce127735e056e64bd6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://seumenha.ru/123?utm_term=resignation+letter+format+for+teacher+post PDF link annotation
    • https://cdn.sqhk.co/bijukipuj/YIXfjhy/kulatewawowuboji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484358/normal_60554a386e978.pdfIn PDF document text
    • https://cdn.sqhk.co/morexemodoju/Wijiejc/desktop_launcher_for_windows_10_users_pro_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490125/normal_5ffdb7aa7e79d.pdfIn PDF document text
    • https://cdn.sqhk.co/parepejapoki/iaaicrJ/monster_jam_steel_titans_xbox_one_digital_download.pdfIn PDF document text
    • http://situvupumu.medianewsonline.com/10477966868.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/fjbhege/92008942873.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/38jbqgq/burid.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/niijhja/69471288931.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421199/normal_60383ee408aa3.pdfIn PDF document text
    • https://cdn.sqhk.co/jafipago/tiesghx/include_soap_header_in_wsdl.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/tutasujal/jelorilisave.pdfIn PDF document text
    • http://tipatanakuke.onlinewebshop.net/rurefurubakojasuli.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/gakitalewikij.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/dumedejafipiti.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/gopro_hero_3_wifi_password_recovery.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/429908940.pdfIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_612b762463904ee49c70d87d02b15b79.pdf?index=trueIn PDF document text
    • http://terumalok.atwebpages.com/amarilli_mia_bella_baritone.pdfIn PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_5b804df4d4a14e05a7c1e322e4c3e656.pdf?index=trueIn 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_off0000e4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CC 5436 bytes
SHA-256: 615748420cc2aecf570c9ede6cf7a8d9e84c1a74813f17cd0a0c00af977f80fa
font_01_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 10432 bytes
SHA-256: 9e63e1e68d65ea9d21586b9d88633e4286c121f66fbe20bcf922beefdd5cfed4

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