Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e75f5c347bc08d…

MALICIOUS

PDF

70.6 KB Created: 2021-03-15 17:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ba0b4a9bfcc376643309cab90a11cab8 SHA-1: 65b9e83c6d9f6b1d649e576a29ad61c09e51f1ac SHA-256: 90e75f5c347bc08d9b5ad5ec26bcad0f1b45266356d1e4a93c4955eae37fa336
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for ClamAV detection. An external URI heuristic points to a suspicious URL, which is also listed among the extracted URLs. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/wix?keyword=dilution+concentration+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/bodavadu/F2Kgi22/32511569058.pdfIn PDF document text
    • http://bemigovoso.iblogger.org/88637781340.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/lgjhhfy/huawei_honor_uk_store.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/ghijCja/didion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_0ea365510e2f49b6b51b63ef0032b62a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/film_animasi_kartun_lucu.pdfIn PDF document text
    • http://xojesenokok.epizy.com/constellation_map_poster.pdfIn PDF document text
    • http://pusagulubuke.rf.gd/laxaxiwigariv.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/smart_greenhouse_project_report.pdfIn PDF document text
    • http://tesekinapoden.epizy.com/modern_antenna_design.pdfIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_8ff295d7102c425eb1cc066528a884f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/tanomogulafux.pdfIn PDF document text
    • http://folixuk.rf.gd/pizirawunorunafozajuwupan.pdfIn PDF document text
    • http://zopegekole.rf.gd/hotstar_apk_latest_version_5._17._52.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_7074a574fed54475866b2013250c83f8.pdf?index=trueIn PDF document text
    • http://kixulal.rf.gd/xinatalanodutet.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_1a5152fcd8f84263a438a5d4b5b3fbab.pdf?index=trueIn PDF document text
    • https://7f507849-5a67-47d8-9eb0-f7f10ac327ba.filesusr.com/ugd/cacfd7_9be6ec95992c4a3495bb4d128d61b12a.pdf?index=trueIn PDF document text
    • http://gozebodene.rf.gd/nimavo.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/believer_remix_trap_nation.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_off0000d37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 5044 bytes
SHA-256: 98fd49ac459d72783518a701f7e0b6215df07ed7b46eedd9c2de37a04322f681
font_01_sfnt_off0000e4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 11500 bytes
SHA-256: d32d2b29b8ea839a05ca4e058f5d43f0d9b86533b6d32aa7996418b928dffdd4

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