Malicious PDF — malware analysis report

Static analysis result for SHA-256 a059be4d5e109076…

MALICIOUS

PDF

82.6 KB Created: 2021-03-19 18:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 38c74c2a8b3db2b35777c9f75617b8f6 SHA-1: 9ce231e8e6a4fb0b088585ba32bdc2cb4cf01ee4 SHA-256: a059be4d5e109076ed6ea1b3493f8924d40d4a448772fcd4446075ea7c80de01
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://yafferge.ru/award?keyword=classifying+rational+numbers+worksheet+6th+grade+pdf', is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL within the document body suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://yafferge.ru/award?keyword=classifying+rational+numbers+worksheet+6th+grade+pdf In PDF document text
    • http://nipokaxa.getenjoyment.net/4_poemas_cortos_que_debes_saber_en_lengua_indigena_nahuatl.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/zigutekadewewaguxanosumu240ug.pdfIn PDF document text
    • https://cdn.sqhk.co/lofesaxudiwo/gdigjjl/influencer_marketing_companies_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/sFhjigG/pilot_flying_j_truck_stop_closest_to_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/haMBhel/58289206203.pdfIn PDF document text
    • http://chambre.xyz/xudescoqcb.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/vsWjfhb/car_dr_obd2_car_diagnostic_scanner_tool.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/xghiajj/asphalt_8_apk_mod_dinheiro_infinito_2019.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/botanical_names_of_plants_and_their_common_names.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajobeg.epizy.com/black_s_law_dictionary_5th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/adding_and_subtracting_fraction_worksheets_with_answers.pdfIn PDF document text
    • http://vujiwexamofone.rf.gd/20681532134.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/what_word_describes_the_allele_for_green_eyes.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/16793146393.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/pabovukawolizome.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/silopilurolomeferuxipuxe.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/acemoney_software_free.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/delta_unisaw_serial_numbers.pdfIn PDF document text
    • http://bajamixowi.epizy.com/loan_agreement_template_uk.pdfIn PDF document text
    • http://nogafojomor.onlinewebshop.net/navimadepulolezowalibusem.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/2212408965.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5912 bytes
SHA-256: 16599ec467db84b5dc438d2c7a7a72de861332a2d11b2d9f513c2158a68e43b7
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 11456 bytes
SHA-256: 31b4fac4f6df05fbd4be3aa7a2021153753e1f3bb254f3f60bb32bca9df1dae5
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 16164 bytes
SHA-256: 3afbc95f4a2677bf4c8b77bd7df62e4dbeb651db4b5e482cf97b58e472170d58

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