Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c95cf3abe42a390…

MALICIOUS

PDF

72.4 KB Created: 2021-03-09 13:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 569ba56740ae6078e0279f0f56d03281 SHA-1: 519b740310330c940d3e734134efe7e06c6c6866 SHA-256: 1c95cf3abe42a390eae2fd0cedc2b9c3d55be35e514c6b2abb1cd46fb34feb12
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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
  • 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=blanco+sink+care+guide PDF link annotation
    • http://hookup158.fun/30498715265kbs5n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_601eae1c39cc4.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/the_lowest_animal_by_mark_twain_sparknotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_601ee258b7cad.pdfIn PDF document text
    • http://uose.xyz/gufejujupuruxakixege6vrbp.pdfIn PDF document text
    • http://reassurez-moi-fr.info/11920852698g5ntm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449603/normal_5fca23b7976de.pdfIn PDF document text
    • http://muzoc.xyz/best_wing_chun_kung_fu_books1xuuk.pdfIn PDF document text
    • http://dezlice.ru/coloring_sheets_for_toddlers2iay7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453334/normal_5ff1c931c7dbe.pdfIn PDF document text
    • http://karma-911.com/bible_quiz_questions_and_answers_from_the_book_of_jonahovkah.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/what_is_the_salary_of_cabin_crew_in_indigo_airlines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_60029b83b1695.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namepafubi.atwebpages.com/what_is_the_purpose_of_the_12_disciples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb0be89-b911-4c52-b9e3-2e7498ae48b5/craftsman_225_mph_electric_blower_vac_manual.pdfIn PDF document text
    • http://jeborawaleko.atwebpages.com/sonicwall_tz_105_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18d7ac0d-ebd2-419b-9d0f-7d940622b5dd/78521913165.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_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 5220 bytes
SHA-256: ba704ae392c04f1571f18dd576cfbe9c90739e1ac262e83f7abf3dde7b848995
font_01_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 10436 bytes
SHA-256: 4fc60bf7766ca6df4ad0aa7429e15df1734d19719b0ff1c55f7a9240742b5bea

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