Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c38514b5973fd0…

MALICIOUS

PDF

73.9 KB Created: 2021-02-07 09:10:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3cd5c5e5c38c3d2bad45fe4fa818baff SHA-1: a7e53a390bb54d0b2eecea0fce0aa087d60067cd SHA-256: 73c38514b5973fd0adc2879e6453fe4f501eb2c0e77ed554c382fd6e89f7ce4a
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by a machine learning classifier and ClamAV, which specifically flags it as 'Pdf.Phishing.Trojan'. The presence of an external URI pointing to 'leonvi.ru' suggests an attempt to redirect the user to a malicious site, likely for phishing or payload delivery. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=the+republic+plato+pdf+grube PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4502236/normal_5fe30eecb3f0e.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/ehdzqyq/gelidaguxuvuduzer.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/fSjaAgg/project_drag_racing_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449605/normal_5fe8b65769369.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444374/normal_5fd8995d585f4.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/hhhJibE/64_bit_windows_10_pro_activation_key.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/xeruxaxer/48807580866.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/vaaste_song_dj_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/54264249907.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/best_antivirus_for_android_2019_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/chegg_ereader_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/uber_defensive_driving_course_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/nuzunami.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/34910959235.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/simple_plan_astronaut_lyrics.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_off0000e132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE132 5328 bytes
SHA-256: 6db085588aa2ebfded09c4ace53037f6e4e628300cddcc45386d940ff8d29402
font_01_sfnt_off0000f342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF342 11668 bytes
SHA-256: e7da76791e59516f7cb22a024cf4518df9275c24ca05680c79f0135450697bbe

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