Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e05a20e41eb32fd…

MALICIOUS

PDF

76.9 KB Created: 2021-04-04 10:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f14e02daf337faff6f81876435252e3 SHA-1: 9178e560ad7b833c519724154bc7986545256847 SHA-256: 0e05a20e41eb32fd0662e2afcc06c29787a4e4eeeeda35428c017b2584975893
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 0.9998

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
  • 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://lozipotod.ru/strik?utm_term=elements+of+quality+system+ppt PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465133/normal_5fe408372e7e9.pdfIn PDF document text
    • https://cdn.sqhk.co/ninasodivofi/gdLshiK/mtg_champion_decks.pdfIn PDF document text
    • https://cdn.sqhk.co/dobajinorite/jbhfdgd/amcas_letter_of_recommendation_letterhead.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/hgzgWbG/space_ship_clip_art_drawing.pdfIn PDF document text
    • http://zokisomipidekod.iblogger.org/anesthesia_drugs_handbook.pdfIn PDF document text
    • http://birobupalojasux.iblogger.org/first_flight_class_10_question_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/6hcp1gf/buffer_company_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/sezepemanu/zRjf2ha/portal_knights_cross_platform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456984/normal_6025cc5dd369c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5fcc0c0fdb038.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/33bd0a5b-694b-46b8-83d2-87d24c6504d5/witcher_2_gameplay.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/nobovukenabanifu.pdfIn PDF document text
    • http://tesoduv.rf.gd/winnie_the_pooh_book_a_a_milne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879a080a-d960-4e27-b390-cd943d6cc651/cmo_ganar_amigos_e_influir_en_las_personas_dale_carnegie.pdfIn PDF document text
    • http://bofapivumike.rf.gd/77812376788.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/classic_african_american_books.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/translator_job_description_template.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_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 5136 bytes
SHA-256: 0c7fff7bb9060498c5843d4029531ca99561daacbaa816a3481e83581b5f0cfd
font_01_sfnt_off00010151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10151 11120 bytes
SHA-256: 3a4b7e72ad4324046fb217efa848d9cd24ef38813161d13477d0dd6ad4df3550

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