Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4082ddf5e26c77a…

MALICIOUS

PDF

82.6 KB Created: 2021-03-17 09:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 613d1a26d92b7c8d0b510d2170033791 SHA-1: 9370d0b1d38b7803b787b627161bf17749ee88bb SHA-256: b4082ddf5e26c77a54901d540b1535efc390fe1cd30e0ee70f80eef83a54d673
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 0.9998

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://crophysi.ru/award?keyword=amonio+saccas+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475577/normal_5feb6519cb6c1.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/2d62c129c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5fdd712b022c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_6036d71387e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_5fd8448786ef0.pdfIn PDF document text
    • http://kinorio5.xyz/data_structures_and_algorithm_analysis_in_java_2nd_edition_mark_allen_weissc9vu1.pdfIn PDF document text
    • http://introdom.ru/5954094572288uyb.pdfIn PDF document text
    • http://jsexj.fun/trkiyenin_masif_arazileri4kdey.pdfIn PDF document text
    • http://eagleaff.com/remolekimevatezil9pvtt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_604a20fa59284.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/58015b3c4ff1f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53328bd9-9ba8-4d47-9cfa-d3208345d0ce/susotudowabi.pdfIn PDF document text
    • https://bb209e34-24c3-4901-88bd-c00af8cda710.filesusr.com/ugd/de6798_f6b1945f4b834e07890b3b277b1c2eef.pdf?index=trueIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_70ceda3c1e654974a52bbdd1c6054edb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9dc1e0f-b173-4345-8c57-c707d2ebfdef/big_data_analytics_tools_and_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf544354-4b48-46ee-9353-d167b9e539bc/does_directv_app_work_on_firestick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0678cfbf-244c-45c5-9221-9a0029ac712a/vababeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17bbb77a-8ec7-4d4a-a0e9-cd598c904a0d/tp_link_wr841n_firmware_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40ee7d8-721c-43b1-a561-40322dac08a1/instrumentos_de_recoleccin_de_datos_en_una_investigacin_ejemplo.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_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 5160 bytes
SHA-256: 618c8e4697e89c70a1b8604cd7e06d6432bdedea1b8d33cefa13d13fb17ebc61
font_01_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 16016 bytes
SHA-256: 4159e7e6bd93706cc6536cc5fcd4f6957169168afd7936bab8080d3af7a9f8c1

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