Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4c0ba02a9f8ef0…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 12:18:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03cea2201475d9dc1536031efc290aed SHA-1: aeaa32e7b51314e5817a13dcf01000cd17866c00 SHA-256: 0f4c0ba02a9f8ef08d136ad80602607e8515176eb1c687397af39c540b6e7a6a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://midufefew.ru/award?keyword=aren+t+you+glad+you+read+this+pdf', which is a strong indicator of a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text fragments that suggest a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/award?keyword=aren+t+you+glad+you+read+this+pdf
    • http://tohld.in/rupukemuvo46fl0.pdf
    • http://bapulesaj.mygamesonline.org/assam_tribune_newspaper.pdf
    • http://legendnat.space/pomiwagarakada2oqgm.pdf
    • http://fibutogu.mywebcommunity.org/20932116694.pdf
    • http://glav.info/soft_tissue_cavernous_malformationgu0yh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/minaxigevani/39729343872.pdf
    • https://uploads.strikinglycdn.com/files/dbed6bf6-8ced-4938-b062-3c1b110d31e4/active_passive_voice_rules_chart_in_hindi_download.pdf
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_3ff3eda3ce5d4718be958d271c0d230d.pdf?index=true
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_ad71ac2d1ea440009310ed0a45860f57.pdf?index=true
    • https://s3.amazonaws.com/nokiva/fezutujogapufupa.pdf
    • http://nunakonagavigik.epizy.com/alabama_a_m_university_application.pdf
    • http://kimoviranonaf.onlinewebshop.net/tokoxetosugejex.pdf
    • http://wuvopopimuwes.rf.gd/lezupuwugat.pdf
    • https://uploads.strikinglycdn.com/files/27ab07a3-311d-4b96-bd9a-6bf9644a3531/atlas_copco_compressors_canada_montreal.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_75ad338d26e748e2b81272a8b1b28ebb.pdf?index=true
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_ec877fa3d2894e03ad3ca572699c419a.pdf?index=true
    • https://s3.amazonaws.com/vawoginele/dusobodukidigo.pdf
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_843f4399496e401d96498d83fedca16e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8dccb64e-545f-4dc1-b11f-033296651ffe/18774837451.pdf
    • https://uploads.strikinglycdn.com/files/22d71123-6423-4003-b4b5-5fb4c8a62a78/how_to_make_yourself_an_avatar_in_photoshop.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_off0000eda2.bin
198a288492fd65ac8b05d9e31e56abc04c5f8febf0736814d1a5dcb9f1fcb563		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 5396 bytes
font_01_sfnt_off00010000.bin
1d202811eeca841a75a5a4674402c2b3a919e33ac10339a3586c4238fa1635bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 11440 bytes

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