Malicious PDF — malware analysis report

Static analysis result for SHA-256 b897b5239bf9d283…

MALICIOUS

PDF

87.3 KB Created: 2021-03-30 01:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1033d052ae0d383309a57b2c7c27da06 SHA-1: 25c44a5119d3617c6a0b0b8e9186506e152b018b SHA-256: b897b5239bf9d28368d4d2a7768809d5d3033580c6c3928f855ca48ee8894716
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic and numerous unknown reputation URLs suggests the document is designed to trick users into downloading further malicious content, likely for phishing or malware distribution. The document body is heavily obfuscated and contains no readable text to further clarify its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/wix?keyword=time+budget+worksheet
    • http://micrometer25bill.site/iknann_psikolojisitwlke.pdf
    • https://cdn-cms.f-static.net/uploads/4403556/normal_6057064522c25.pdf
    • http://oneitshop.info/fupobobawixusof05rv1.pdf
    • http://kleomaften.online/35646768935rgvmb.pdf
    • http://petersikdar.com/20399024923h80m3.pdf
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5ffe8492cbddc.pdf
    • http://nat-yoga.space/goalkeeper_gloves_size_guide_agei1uu5.pdf
    • https://cdn-cms.f-static.net/uploads/4499958/normal_60468d15b410d.pdf
    • https://static.s123-cdn-static.com/uploads/4454665/normal_60069376817b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_08b78eb94fbf473ebce8948b0758ca71.pdf?index=true
    • https://s3.amazonaws.com/tirimofufemukat/oxford_bookworms_stage_6_free.pdf
    • https://s3.amazonaws.com/salade/little_alchemy_2_guide_a-_z.pdf
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_3f33b9747830452baa09f2a9d6bc28c1.pdf?index=true
    • https://651f5d5e-5f42-4fb0-8380-889764ca350f.filesusr.com/ugd/b2f7c1_71efb11f874b4c3eb6061dc7d8a73837.pdf?index=true
    • https://uploads.strikinglycdn.com/files/78f2919d-fd54-473d-ba32-7c675b7a625c/17160897218.pdf
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_31406b4a4f254f589d59abeb2856ab8b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/630c252f-f79f-416e-bc04-a413df7eee9f/gunapin.pdf
    • https://s3.amazonaws.com/legesiliv/braun_electric_shaver_series_9_9290cc_black_friday.pdf
    • https://uploads.strikinglycdn.com/files/0e123655-8939-4981-bc31-77a97b0105a3/best_grammar_book_for_english.pdf
    • https://uploads.strikinglycdn.com/files/acb53911-751a-4a15-ac96-39428f00acf2/skyrim_how_to_change_load_order.pdf
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_c448db56593a409c8ab088919940f061.pdf?index=true
    • https://s3.amazonaws.com/tinivukedeta/el_arte_de_amar_libro_completo_descargar_gratis.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e6.bin
ce394de1b2eaba302a2dde3bdb27d3c5f6cc8b29055d4043f76cb3e2c697ceb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 5240 bytes
font_01_sfnt_off00010898.bin
dfa191ac1abd2fe9e1531dee19a3c659e06ab819986d41441fa4c7e0fcfccca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 4440 bytes
font_02_sfnt_off0001147e.bin
4e5733ac0badc34cb88a81891107700954dcf91cb5560d0d6b636b163834c8e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 10824 bytes
font_03_sfnt_off000139bd.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 16312 bytes

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