Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf073a9851e036ba…

MALICIOUS

PDF

80.2 KB Created: 2021-03-12 17:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 87bcdb22bc4077f4e5ef06434777f369 SHA-1: f24f057a0c1dd6cca3fa79192eeac8637bbe2d75 SHA-256: cf073a9851e036ba4823193105bda570d342fe18f8fc64d05fc79c3da7231fe4
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with the primary one being 'https://vilenefex.ru/award?keyword=pdfbox+pdpage+example', suggesting a phishing lure. The presence of PDF-specific heuristics and embedded URLs points towards a phishing document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=pdfbox+pdpage+example PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413374/normal_5fe403a00d2e6.pdfIn PDF document text
    • http://vesefotaso.iblogger.org/what_is_the_largest_brown_bear_ever_recorded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393752/normal_5fe9ec4ed5332.pdfIn PDF document text
    • http://doxulim.iblogger.org/kolid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5ff982b88883f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372960/normal_5fe507fb25c44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_601373b0150b5.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/edit_document_text_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471252/normal_5fcc5e7169e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_600cca8c1cf7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_60251fbf5c74b.pdfIn PDF document text
    • http://tijudiwulewanuw.getenjoyment.net/25417493224.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/mironovetuxok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_602dd34451897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5ff4011ec06e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_6021ef2e6728a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lefivagalowo.rf.gd/vpn_for_pc_free.pdfIn PDF document text
    • http://xafuvarajuxeg.epizy.com/ejercicios_de_pronombres_relativos_en_ingles_con_solucion.pdfIn PDF document text
    • http://jawuguv.epizy.com/samsung_catalogue.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/72160888999.pdfIn PDF document text
    • http://zijurape.atwebpages.com/best_way_to_annotate_ipad.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_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 5296 bytes
SHA-256: 1894c413af8531ebe07f10f6e80d535fa19f57dca50878e54a6ea334c5c3d900
font_01_sfnt_off00010688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 14436 bytes
SHA-256: e15383bd12294723e8bc63a1b49a859723103caea3915755bf2382ec77fa3282

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