Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86824079faf1da6…

MALICIOUS

PDF

73.0 KB Created: 2021-03-02 23:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cf938e635a136bc276249c39cb99ebf7 SHA-1: 07276badf4ed2309e58ac06b63d89a3043a80382 SHA-256: c86824079faf1da65a7c20aada3b404c93f0f4c116708afc74b345a014468e9a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to business communication presentations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=delta+business+communication+skills+presentation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421049/normal_602e1652c4cce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_60094c4168f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_602e3bc52be2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_5fe8a617ae151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_602a54fbc997f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_6003e197d106d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_600a9195e6c97.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/vajefam/88973557738.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/jingle_bells_hard_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/mijodaleminuboraf.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/26130148362.pdfIn PDF document text
    • http://kelamivajaw.rf.gd/what_does_it_mean_that_driver_is_unavailable.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/reid_street_primary_school_darlington_ofsted_report.pdfIn PDF document text
    • http://luzutajezilako.rf.gd/can_you_block_withheld_numbers_on_android.pdfIn PDF document text
    • http://lidezitenojugit.epizy.com/email_template_salesforce_object.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/59656424245.pdfIn PDF document text
    • http://nadutalafex.rf.gd/67383657156.pdfIn PDF document text
    • http://fubegamo.epizy.com/antonino_cannavacciuolo_libri.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/how_to_draw_faces_realistically.pdfIn PDF document text
    • http://wuzofexobe.rf.gd/whats_another_term_for_riding.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_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 5504 bytes
SHA-256: ae98caf79228a7303521a70104395d5cd096b3fd0614c417b4016a16965367fd
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 9984 bytes
SHA-256: 89e35375e52fc6715b936bdb719c891c2d20d0ada13d06832ca8e37e5d717822

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