Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7c5974584154ca…

MALICIOUS

PDF

97.3 KB Created: 2021-02-16 08:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0cfdc1d13879a3981e334e0e1622662 SHA-1: 1648371719cc3a8a0c6a54a8c61fa69e6ed59f1d SHA-256: 4c7c5974584154cab9a030296472f7a3f8fa87e2324bdd7f8efbe9f39f5a43a6
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 part of a phishing campaign. The document body, though heavily obfuscated, suggests a theme of 'campaign ideas', further supporting a social engineering 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://jacksth.ru/strik?utm_term=5e+campaign+ideas
    • https://cdn.sqhk.co/gediwuwanol/hiQeihq/lebunijok.pdf
    • http://samo-katim.ru/tensei_shitara_slime_datta_ken_lightpm0nn.pdf
    • https://cdn-cms.f-static.net/uploads/4412592/normal_600b028888127.pdf
    • http://mnclassis.org/bihar_board_12th_model_paper_20200wawo.pdf
    • http://stakingyfi.com/gabodododiraxusimoplfvwu.pdf
    • http://lotto-investclub.com/test_water_for_coliform_bacteriasgvzu.pdf
    • http://ryduslim.website/samsung_galaxy_s9_android_10_q5pw20.pdf
    • http://arevakar-travel.com/bujemibixitaboualos.pdf
    • https://cdn.sqhk.co/ledivure/hcjjjil/cheap_piano_lessons_near_me_for_adults.pdf
    • http://lestyprin.online/telokuam8uz.pdf
    • https://cdn.sqhk.co/nilesatu/Q9gdlCt/53247177949.pdf
    • http://gebuhrenfrei-mein.com/20802886494944sb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/litunux/where_can_i_donate_new_toys_for_christmas.pdf
    • https://s3.amazonaws.com/xoguwavosuje/pajomirometuwoxurowiwini.pdf
    • https://s3.amazonaws.com/zagapaxa/12898155649.pdf
    • https://s3.amazonaws.com/nilafafakem/65390693460.pdf
    • https://s3.amazonaws.com/fewunadupop/cover_sheet_for_fax_free.pdf
    • https://s3.amazonaws.com/jupoti/dalemukibosugewepuvegezot.pdf
    • https://s3.amazonaws.com/juduk/74146738690.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_off000141e6.bin
cc1438ff6436ab2495587dc82bc10f5ea341f4ea5796d000000e30650b9a56fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141E6 5292 bytes
font_01_sfnt_off000153d6.bin
8aa9ccb3b10ac5eedb78c1db07c17a68a8682225f67ead0a76b5e27c9f21b5d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153D6 10696 bytes

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