Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd7b4b4453c7c1c…

MALICIOUS

PDF

93.6 KB Created: 2021-03-04 17:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 15d9f90532214ccabb4af535ad7672ac SHA-1: fb973101e49050a9ca359e1ce9bb5c365568f224 SHA-256: dcd7b4b4453c7c1c275080954bc8f6077f9a889daa336aa9f3b8dca1e705134a
96 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a malicious domain, identified by ClamAV and a machine learning classifier as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'Hvac basics book pdf', indicating a social engineering attempt to trick the user into downloading a payload. No scripts were extracted, but the presence of external URIs and the malware detection strongly suggest a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=hvac+basics+book+pdf PDF link annotation
    • http://rutidewebatodug.iblogger.org/aashiqui_movie_songs_telugu.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/sumaxifukozexuzupuputizos.pdfIn PDF document text
    • http://lufawobakisi.22web.org/harry_potter_movie_auditions_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5fc8660029110.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470017/normal_6000d257b3b5b.pdfIn PDF document text
    • http://gexuniganije.iblogger.org/55188753946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478141/normal_60052034bf7ce.pdfIn PDF document text
    • http://pesavobedevas.22web.org/tennessee_football_schedule_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fc652d3e1e41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vevojadiren.epizy.com/avg_antivirus_premium_apk_free.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/how_to_replace_a_ge_mwf_refrigerator_water_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/kufajumivolapegi.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/werudekalopetidapamawedi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/cube_test_report.pdfIn PDF document text
    • http://gijomifede.rf.gd/instagram_apk_for_ios.pdfIn PDF document text
    • http://sogurorirerew.onlinewebshop.net/piveduji.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/54409793207.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/surojeridaluwafojalinam.pdfIn PDF document text
    • http://sozidimimu.rf.gd/bawivov.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/heat_and_mass_transfer_solution_manual_5th_edition.pdfIn PDF document text
    • http://zisuvedo.rf.gd/87710687854.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/68485847528.pdfIn PDF document text
    • http://getetir.epizy.com/shiv_aradhana_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/67801571923.pdfIn PDF document text
    • http://fukanabe.epizy.com/27763242778.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_off0001301b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301B 5244 bytes
SHA-256: 29a11c235b8cd98403036df109f8a9aa643e04445476ff7c9c4ecd4054e44d6f
font_01_sfnt_off00014206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14206 11512 bytes
SHA-256: e1250cf83e25c5004018d3833d6125d91e562bc0305587b756edb8145a118015

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