Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16e2441686ccd98…

MALICIOUS

PDF

76.2 KB Created: 2021-04-02 14:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36dc6618a52b6ce2cf4b47aed82e48b8 SHA-1: deedb3f85574aab3105683e7002b17eca4275b20 SHA-256: c16e2441686ccd98c4b684e79db71638e5b2c709cbdc478a3bcb450e79c88a65
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious external URL. ML and ClamAV classifiers strongly indicate maliciousness, likely phishing or malware distribution. The document body is heavily obfuscated, but the presence of the external URI suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=aisc+allowable+stress+design+pdf
    • https://cdn.sqhk.co/tebefaravuz/XjfjcOT/twisted_sister_cupcakes_cakes.pdf
    • https://radoduwew.weebly.com/uploads/1/3/4/3/134351920/robarelatel.pdf
    • https://static.s123-cdn-static.com/uploads/4458417/normal_5fcaf6b2e06ec.pdf
    • https://cdn.sqhk.co/gozigawefo/iidbjg6/blue_bottle_coffee_nyc_delivery.pdf
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/2ca3ef92f7669d5.pdf
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/womexenuvab.pdf
    • https://static.s123-cdn-static.com/uploads/4413987/normal_5ff8098b4e487.pdf
    • https://cdn.sqhk.co/zogobadakedu/igzqghP/fuvirufebirafepam.pdf
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/020c1792cf43f8.pdf
    • https://static.s123-cdn-static.com/uploads/4468812/normal_5ffcaa87f1b71.pdf
    • https://cdn-cms.f-static.net/uploads/4494429/normal_6017b642b44ae.pdf
    • https://static.s123-cdn-static.com/uploads/4371003/normal_6007f0053cee7.pdf
    • https://cdn-cms.f-static.net/uploads/4463279/normal_6063600ce0cdf.pdf
    • https://cdn.sqhk.co/jenetuwuda/hcjicha/rapugerafaxo.pdf
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5fe15939b0a04.pdf
    • http://nurukemuwonudu.iblogger.org/similarities_between_the_lightning_thief_book_and_movie_chapter_16.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zawovasozanadi.epizy.com/38943743817.pdf
    • https://uploads.strikinglycdn.com/files/f4c7ebf3-f183-46c8-86d0-2c5234e7c706/rosemarys_baby_author_crossword_answers.pdf
    • http://zegegapo.rf.gd/deficiencia_de_vitamina_a_en_aves.pdf
    • https://uploads.strikinglycdn.com/files/429b439e-5164-4b49-a59b-7f359e016090/wall_street_journal_online_membership.pdf
    • https://uploads.strikinglycdn.com/files/c8e8d75e-a086-4533-b7f1-5a93b9588529/71493661458.pdf
    • https://uploads.strikinglycdn.com/files/72a29d54-20e4-4473-b6e8-3b59849937f3/winter_weather_predictions_for_oregon_2019.pdf
    • http://ruzuvune.epizy.com/access_bars_chart.pdf
    • http://tezajiduzut.epizy.com/tin_tin_chinese_takeaway_menu.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_off0000eac7.bin
a50116f13a71e944762a83ed465ef0664a05c20319b42bbc3f0e003407533bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 5544 bytes
font_01_sfnt_off0000fdc0.bin
c00c527b996bd75878054c4437dd347305ed026c0d1bf84d656d3bcadd634c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 11336 bytes

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