Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3aaa51afc94075…

MALICIOUS

PDF

84.9 KB Created: 2021-02-28 05:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3c1ef7d9b9c11e390a31a95fbebde5e9 SHA-1: f2097a1824a822ae2f32b158ea6beb7dd8d0c4a9 SHA-256: 6b3aaa51afc940752cb7443a3c501f8eba4d0860d1d03c015d5003709ac36296
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics flagging embedded URLs. The document body, though heavily obfuscated, suggests a lure related to 'relative adverbs worksheet pdf'. The primary malicious indicator is the presence of numerous external URLs, one of which is directly referenced by a PDF_URI heuristic, indicating an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=relative+adverbs+worksheet+pdf PDF link annotation
    • http://muzibatixabu.mypressonline.com/sapilezugabukapu.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/how_to_create_a_standard_normal_distribution_table_in_excel.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/72061124500.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/maytag_neptune_washer_repairman.pdfIn PDF document text
    • http://usesalon.xyz/cabin_fever_2002_full_movie_720pouhss.pdfIn PDF document text
    • http://tokepubex.getenjoyment.net/altistart_48_fault_codes_clf.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/how_to_check_injector_pump_pressure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/78332008173.pdfIn PDF document text
    • http://pigutun.myartsonline.com/kogajofimele.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/pamarab.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/27819362071.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/radish_seed_germination_experiment_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/tozomuxukuvo.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/92947027769.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/delegated_authority_policy_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 5492 bytes
SHA-256: eba36e6ad47c2a23a4316d00fa83848a5946eeed8b5bf9ffa8678dc93e555083
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 10872 bytes
SHA-256: 04b6005c374d04127bdc537f5a00aae1e8f83190c70814f3bc5fa6166a3a9363
font_02_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 16304 bytes
SHA-256: 3d767fd0475985efb97c57510f837100d97b5dce8c2cf91b7be24a5ebd7a9b52

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