Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf44bc1e14ce243…

MALICIOUS

PDF

68.5 KB Created: 2021-02-25 19:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8179cce722c093bfe64f4fd713ed1ae0 SHA-1: 461cb091bf819aa6180fa4d17f1386e00607aa19 SHA-256: faf44bc1e14ce2437c82cbce4ec0adda0380af9a05d121e5f3c3e2c71d34da0f
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to 'leonvi.ru', which is presented as a 'network study guide free'. This suggests a phishing or credential harvesting attempt. Numerous other unknown URLs are also present, indicating potential for further payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wb?keyword=network%20+%20study%20guide%20free PDF link annotation
    • http://copyrightnotice-ig.com/kutozirajugubigaremubvd9t.pdfIn PDF document text
    • http://mnatural.space/madojisuloxfa0zo.pdfIn PDF document text
    • http://pubggaming.online/jigoliwaxopovdp5xg.pdfIn PDF document text
    • http://urro-hu.com/46101162812oja7r.pdfIn PDF document text
    • https://gurovepulebeguj.weebly.com/uploads/1/3/1/1/131163897/9755174.pdfIn PDF document text
    • http://static-start.top/nexonejanigesewigog4hn2.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/botazidukodix-jujal-gukususoleburof.pdfIn PDF document text
    • http://silver35.ru/the_left_hand_of_darkness_analysisyb7mg.pdfIn PDF document text
    • http://igonlinesupport.com/gokano_points_generatoro0x3x.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/fokaliwaxixariiuvav.pdfIn PDF document text
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/af76e274f.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/saduko.pdfIn PDF document text
    • https://tebifenan.weebly.com/uploads/1/3/4/6/134675993/takamunevopos_rubaxolu_nepiso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/apink_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/free_printable_punctuation_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/muwopiradajigub.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/jevuzebelo.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/games_to_play_with_4th_graders_on_zoom.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/java_programming_language_cheat_sheet.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_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 5060 bytes
SHA-256: 4813a2782c61681d27fae6409d67af81f32a2b6f69ff6b2a2da5991ed177e9e7
font_01_sfnt_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 10768 bytes
SHA-256: 8d59a5e229abde6850920e3fd8922b68fd41267327280be9efe91707d0b20fcb

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