Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5318213bb7759ea…

MALICIOUS

PDF

81.6 KB Created: 2021-03-30 06:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6dfe96343dfd1a23006644838a02b872 SHA-1: efcf797f989a4754b6ac59c467559a3e6d791506 SHA-256: b5318213bb7759ea1d79fe0c6c439e07b4a24fa7112bc9c70d173e32662e3e7d
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 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=application+letter+for+a+teaching+post+pdf PDF link annotation
    • http://wei-nmvc.com/netgear_dgn2200v2_speeda8x5s.pdfIn PDF document text
    • http://bella24.xyz/dodejobelanavojadamufixo3gtmf.pdfIn PDF document text
    • http://beliyden.xyz/performance_management_system_in_accenture25kax.pdfIn PDF document text
    • http://gejurabek.getenjoyment.net/calculus_3_problems.pdfIn PDF document text
    • http://baykamif.space/49884624085prlv4.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/sportline_240_stopwatch_user_manual.pdfIn PDF document text
    • http://picply.ru/ibsen_a_dolls_house_analysisqvs0z.pdfIn PDF document text
    • http://habirovradik.ru/2020_club_car_onward_dash_kit1d5pc.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/sulasatevirexo/32919204152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2739b62-ee94-4c42-847d-5745396af640/how_to_fight_against_parental_alienation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12f1c1a-1285-4c29-8e1c-48f82e0343e7/ronunesejaxe.pdfIn PDF document text
    • http://wowulikuvej.rf.gd/pegalumaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a381ee-ed37-448e-8c25-ece8b8727bac/modern_family_scripts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b043ce3-7dde-42c3-85db-b65655f3cb5d/41077631853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0e08a8-44a3-43f0-9f8b-283a1cf3a447/best_pharmacology_book_for_medical_students_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/ielts_academic_reading_papers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/christian_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/39059327975.pdfIn PDF document text
    • http://mawokale.myartsonline.com/why_is_my_dryer_making_a_loud_screeching_noise.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/56236100337.pdfIn PDF document text
    • http://kofikirigor.rf.gd/ronuxi.pdfIn PDF document text
    • http://lawewil.atwebpages.com/luguvemunuje.pdfIn PDF document text
    • http://roniwixanedif.epizy.com/google_sheets_if_cell_contains_text.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_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 5408 bytes
SHA-256: 16d3cb15ffbed1925ef6e10a2be99c9df72320bac20b76b64a7ee0a7e8cc5c04
font_01_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 10508 bytes
SHA-256: b0de2b3b425234c4725f03e8c4762b28b25d8a63de8e125bfcc4475f32d0e7ba

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