Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b411238463cb8f6…

MALICIOUS

PDF

76.5 KB Created: 2021-02-14 19:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0e2b2deb1ff413c49984eeaa03cd6fa5 SHA-1: 8df79752ca16c3dcede1b3f601e5bbffa9691cd0 SHA-256: 8b411238463cb8f6876c01380499e4b01e6735a46bcef90b1b8495164080f0b9
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that leads to a suspicious domain, identified as malicious by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to 'english grammar pdf'. The presence of an external URI points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=use+in+english+grammar+pdf PDF link annotation
    • https://cdn.sqhk.co/bevizewo/bhigfiD/70114486646.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366365/normal_5fde355385ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489850/normal_601992fce141d.pdfIn PDF document text
    • http://mujepojubum.22web.org/isotope_notation_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5feaeb6a77a17.pdfIn PDF document text
    • http://magic-world.site/zunazoxigunurojorakiz0sgoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379233/normal_5ff676a8d21a7.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/ejf0TPH/estilos_de_vida_saludable_alimentacion_balanceada.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/zewimu/imperial_measurements_conversion_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/72450870878.pdfIn PDF document text
    • http://sigadoba.epizy.com/dell_support_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/update_android_application_without_google_play.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/automatic_control_systems_10th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/27707195593.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/bahut_hard_lyrics_song.pdfIn PDF document text
    • http://veguxakafopuvix.epizy.com/axis_mutual_fund_supplementary_kyc_form.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/85844902966.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/2008416027.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15C 5448 bytes
SHA-256: fd8249e3f4280ef5ced6cd5b8b93479884b442e887ec884acf6ad4ae4da1c070
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 11100 bytes
SHA-256: 7359cfa88347842e371a8aaa7afe42f63a6d37c7116d56447e1b2237bd5333fc

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