Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4e1f5829a99ef1…

MALICIOUS

PDF

76.1 KB Created: 2021-03-20 02:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ef08c3e2224eeda2cf64c71d6ac70f6 SHA-1: 48f1dce81278feca5a7568d95c770cf31abebd79 SHA-256: 8c4e1f5829a99ef1f6891a550daacb0bcbd696534a3aa294e286539c73dcc4a1
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 URI pointing to 'dafemum.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'Edhesive answers key'. No scripts were extracted, but the presence of external URIs and the overall detection profile indicate a malicious intent to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://dafemum.ru/123?utm_term=edhesive+answers+key
    • https://cdn.sqhk.co/lazuxorus/bjf8dXR/24366529387.pdf
    • https://cdn.sqhk.co/pemoxeriko/xbgj4kd/fake_gps_pokemon_go_ios_2020.pdf
    • https://cdn.sqhk.co/pigalixow/ihMgjgi/forgotten_realms_timeline_1374.pdf
    • https://zonilalafujagep.weebly.com/uploads/1/3/4/7/134731182/528b2fcad9.pdf
    • http://xenobezunareso.22web.org/hebrew_dictionary_audio_free_online.pdf
    • http://tepugorotewole.medianewsonline.com/81664059778.pdf
    • https://tizidebiwefixim.weebly.com/uploads/1/3/0/7/130739379/rebuxizuvopikatuzete.pdf
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/95bc93.pdf
    • https://cdn.sqhk.co/lazemowul/aKR7PfO/94234775266.pdf
    • http://tejidetegowewi.iblogger.org/yardman_mower_belt_diagram.pdf
    • http://zonojebiridizo.mywebcommunity.org/79702910828.pdf
    • https://ninujesifig.weebly.com/uploads/1/3/1/4/131453022/buvomugosomu_lunapifoleku.pdf
    • http://xozowilozoga.mywebcommunity.org/building_construction_illustrated_ching.pdf
    • https://cdn.sqhk.co/lituxopevuk/4fDjhia/monugaxatijatokujenamiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://saxarivoje.onlinewebshop.net/15882397019.pdf
    • http://mawokale.myartsonline.com/what_is_service_oriented_architecture_example.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_e1b14177054944fb971fb2a8667f0895.pdf?index=true
    • https://s3.amazonaws.com/xeropizuwe/woralimoresezitogugupixeb.pdf
    • https://s3.amazonaws.com/mejados/anticipatory_bail_application_format.pdf
    • https://s3.amazonaws.com/lekelepowo/vovupamuv.pdf
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_8559985aee7d4f39966efe1f78783572.pdf?index=true
    • https://s3.amazonaws.com/rekorewexidiwo/35175571062.pdf
    • http://siximinifiji.rf.gd/low_sugar_food_list.pdf
    • http://figabubif.rf.gd/mercruiser_4.3_lx_v6_horsepower.pdf
    • https://s3.amazonaws.com/suximawo/bsr_gout_guidelines_2017.pdf
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_d9dfed38070146f4abef01ed2a3e1c98.pdf?index=true
    • http://zimipasazodid.rf.gd/focusrite_6i6_driver.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_off0000ebf2.bin
2e5f099547c57ae03dbc76aa30bf875651313d0e30ea896d008b680e05196f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 5156 bytes
font_01_sfnt_off0000fd91.bin
18a4610b9096d7392fdaad0302b04edd40ec482e60ec199b721ac63255d857c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 10988 bytes

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