Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6e41438eee4b45…

MALICIOUS

PDF

94.1 KB Created: 2021-04-06 21:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75cf068a1970cfef44b62219e5b0f42 SHA-1: 456fbefea569bbf29f70484f09ce2bb5aae3f69f SHA-256: 1a6e41438eee4b452ebea3b9b35b34ec8369d474c06d3b24b82df6d657be8f5d
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for ClamAV detection. An external URI heuristic points to a suspicious URL, 'https://bologen.ru/award?keyword=ielts+reading+pdf+50', which is likely used to host a phishing page or a second-stage payload. The document body, though heavily obfuscated, contains keywords related to IELTS, suggesting a lure.

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://bologen.ru/award?keyword=ielts+reading+pdf+50
    • http://mapugukabazewu.scienceontheweb.net/canadian_passport_renewal_form.pdf
    • https://cdn-cms.f-static.net/uploads/4404741/normal_602f0d50c617f.pdf
    • https://static.s123-cdn-static.com/uploads/4470975/normal_5fdf1389e8fb0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3048379c-06d4-4d68-9e0b-12b7d269553b/basazopobarebedetamoka.pdf
    • https://s3.amazonaws.com/bitajemisajoz/husqvarna_jade_sewing_machine_reviews.pdf
    • https://s3.amazonaws.com/genedesowul/26457377739.pdf
    • http://jimomurapujivo.onlinewebshop.net/velunaromujubo.pdf
    • https://uploads.strikinglycdn.com/files/51d3a95c-6de9-4e2e-a130-65d2726565f0/my_sweet_audrina_film_streaming.pdf
    • https://uploads.strikinglycdn.com/files/03eee244-a998-4e44-a901-059ae384ba34/how_to_be_a_millionaire_real_estate_investor.pdf
    • https://s3.amazonaws.com/mojivikapeti/64804914905.pdf
    • https://uploads.strikinglycdn.com/files/75cbd25d-3808-4634-ba28-f0c933747ad2/shark_lift_away_true_pet_reviews.pdf
    • https://s3.amazonaws.com/kujesulad/protein_shake_nutritional_information.pdf
    • https://s3.amazonaws.com/wizitifowubux/ziwakekakeduvibaxenepudim.pdf
    • https://uploads.strikinglycdn.com/files/be9aa102-9a0f-462f-9398-8701727e08f1/flight_duty_time_transport_canada.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013348.bin
b8b2a571fb42799285bba04ad031e0c2cc0c5ed41c0a52e8c0e82c45b210dadd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 5412 bytes
font_01_sfnt_off000145c0.bin
6c9cb82365bd8814497c85d1cfd64136b0b68b320bdb66d9e55070da41072fb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145C0 10928 bytes