Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a54bbf09bb61493…

MALICIOUS

PDF

73.9 KB Created: 2021-02-15 18:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0c690e68ab4456dea802e22c02988be1 SHA-1: de0a22107be8a9110647b0293a8b004091cd3151 SHA-256: 8a54bbf09bb61493d6914cbf2315c2a88643ad114f9a94b4ba02a22ee9ecf21c
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'jacksth.ru', which is likely used to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to an academic calendar.

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://jacksth.ru/wix?keyword=princeton+2020-21+academic+calendar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408984/normal_601b91dac5fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_60183f4470ebf.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/1iEYhfi/word_stacks_level_1557.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/haZU9Bq/89807470374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530151/normal_5ffbd44a6e8d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_5fcefd8c4518d.pdfIn PDF document text
    • http://akb54.ru/kevolubuvuganoqv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fc8d09cd7a82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470218/normal_5fdd93f4c3ea0.pdfIn PDF document text
    • http://gelchlen.fun/villagers_and_heroes_android_gameplay0t6yb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446027/normal_5fd8dbcca8e16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_601e95b6b970f.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/nOXgiNU/61793781385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gegukisakewomo.rf.gd/exponent_rules_worksheet_math_aids.pdfIn PDF document text
    • http://nenilezum.epizy.com/center_radius_form_of_the_circle_described.pdfIn PDF document text
    • http://budavazej.epizy.com/food_feedback_form_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/85925955927.pdfIn PDF document text
    • http://zazupixuwup.rf.gd/phool_bane_angaray_hd_movie.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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 5268 bytes
SHA-256: 7599c63b8876e7aa50bd51beffe0b43fd6a55b60339114d6152c0bdea896f6ca
font_01_sfnt_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 14464 bytes
SHA-256: 8ae52c92bae698ec9d839030f622b00fbff79ef312dc819ce2703aa3b38fbbf2

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