Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b77104bb45bc590…

MALICIOUS

PDF

88.4 KB Created: 2021-04-23 16:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19bd1f41ef45db09e188de32e7914662 SHA-1: 78556abcbcea6ae30ee7265cd006d49f8c4f59c3 SHA-256: 4b77104bb45bc5901d0907092b654d7dca3aa6ea85dec73aa3da40b501f86e1e
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of an embedded URI pointing to 'xezojetit.ru' and the 'SE_DOWNLOAD_BUTTON' heuristic suggest a phishing attempt designed to trick users into downloading a payload. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=m2n68-la+drivers+windows+7+64+bit
    • https://midunaso.weebly.com/uploads/1/3/4/6/134680252/f06af033.pdf
    • https://jazelisis.weebly.com/uploads/1/3/4/8/134870131/4c03707b16f.pdf
    • http://rufawefojag.sportsontheweb.net/convert_to_word_document_adobe_acrobat.pdf
    • http://juzufezike.mygamesonline.org/8537134811.pdf
    • http://lakujalinifibo.mypressonline.com/butterfly_kisses_book.pdf
    • http://kogejirupu.getenjoyment.net/biotecnologa_agrcola.pdf
    • http://nadipewin.mywebcommunity.org/alabama_abortion_ban.pdf
    • https://gidunixodon.weebly.com/uploads/1/3/5/3/135322071/5416101.pdf
    • https://wawogikaso.weebly.com/uploads/1/3/4/7/134726687/1dc62b937159.pdf
    • http://mokemowowove.mygamesonline.org/types_of_entrepreneurship_skills.pdf
    • http://ratedewu.scienceontheweb.net/61661374424.pdf
    • http://wejafopag.mypressonline.com/xopimidavijekaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lamekukibudinos.epizy.com/82576620739.pdf
    • http://forojiwimudobo.atwebpages.com/megexapoguxerom.pdf
    • https://s3.amazonaws.com/minaxigevani/find_police_report_houston.pdf
    • https://s3.amazonaws.com/bidemewufa/karinepilijewuxoxepi.pdf
    • http://wukevivetarapu.myartsonline.com/writing_exercises_with_answers.pdf
    • https://s3.amazonaws.com/genedesowul/capacitores_electroliticos.pdf
    • http://laxolivavaru.epizy.com/hello_kitty_converse_platform.pdf
    • https://s3.amazonaws.com/guxosa/nitro_word_to_excel_converter.pdf
    • https://s3.amazonaws.com/pukiza/stihl_ms_170_carburetor_rebuild.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bff.bin
d54dcc58cb1faeaed5d06d1583d658ad2e2936549e834248c864b3ee370f2759		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 5584 bytes
font_01_sfnt_off00011f23.bin
1a646343db565bacdc397916ae98ef22b79c5f5425f63fb21e9b5f9038cfe613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 11344 bytes
font_02_sfnt_off000145dc.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145DC 4324 bytes

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