Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd353f4a8b412626…

MALICIOUS

PDF

78.9 KB Created: 2021-03-28 19:38:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d4ae1b7b837df0254a8510540ab2b3bc SHA-1: 2ad86fa543ead0d959ceb4cc20915cbabe27c9f1 SHA-256: dd353f4a8b412626be7981efd695aa7a08686493b749fc269968d25854b83a7f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains numerous embedded links, many pointing to disposable hosting or redirectors, suggesting a link farm designed to lead users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to negotiation strategies.

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
  • 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://crophysi.ru/wix?keyword=getting+past+no+negotiating+in+difficult+situations+pdf In PDF document text
    • http://vubopukupera.22web.org/lajosusasujimabid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446781/normal_60342eeb0683d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413850/normal_6035973f7a016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_606039005abd2.pdfIn PDF document text
    • https://cdn.sqhk.co/zokelotosa/Froafji/bugsy_malone_soundtrack_free.pdfIn PDF document text
    • http://wokadokifoxesav.22web.org/muwut.pdfIn PDF document text
    • https://cdn.sqhk.co/jimevexir/hdjaShB/66438035627.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/rorives/s._s._c_routine_2019.pdfIn PDF document text
    • http://reduxaxu.epizy.com/89612831568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebdbb1cb-6499-4d41-8eaa-2fd4ea242b2c/harbor_breeze_ceiling_fan_light_bulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4ab17b-aec0-4b0a-a3e5-b649f8fe8921/50497522975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925cc843-4312-46f2-bcd8-f0c44f4e89cf/best_mini_fridge_with_freezer_for_college.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/the_culture_code.pdfIn PDF document text
    • http://zusobowes.rf.gd/73931821643.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/xitasole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a020f1cb-c58d-4c9b-985a-c6b44b29a1e4/62631902852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8202e405-4725-46a5-a171-0c33c8bc5926/gixemixi.pdfIn PDF document text
    • http://timufumanusu.epizy.com/arcadismo_projeto_medicina.pdfIn PDF document text
    • http://famirasavu.epizy.com/82298353480.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/zazimilasudi.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_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 5260 bytes
SHA-256: f7bbc33201379825b9ace78458f9b4dca815ff28e6e4678d2c743a4d165af1cd
font_01_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 10872 bytes
SHA-256: c75866a8ab292fe47c5061f6aba8a8866ae92f8829b89fc0ec7ab35126b1d0b5

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