Malicious PDF — malware analysis report

Static analysis result for SHA-256 4988b6c0dfeaf1ae…

MALICIOUS

PDF

74.9 KB Created: 2021-03-13 23:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24350e9ac4cf0b2e4c8f6d8eff5e6411 SHA-1: 7aa38d1e647121bc3b35f85e346781fda8069f8c SHA-256: 4988b6c0dfeaf1aee38ca1e13ed042ccb2a8ac8e41186ef222efa10963a053d8
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://druttle.ru/wix?keyword=ff14+linkshell+npc', suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of multiple embedded URLs, many with unknown reputations, further supports the phishing or malware distribution vector.

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://druttle.ru/wix?keyword=ff14+linkshell+npc
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/giwireg.pdf
    • https://cdn.sqhk.co/gabazumad/vfcjdjb/studio_pets_allowed.pdf
    • http://lobabinuladeri.medianewsonline.com/microsoft_machine_learning_cheat_sheet.pdf
    • https://cdn.sqhk.co/duwefetufe/ejehbhe/bible_stories_for_children_s_tagalog.pdf
    • https://cdn-cms.f-static.net/uploads/4475389/normal_5fd15bbe7d0a1.pdf
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/vamuweloxotilo.pdf
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/7611737.pdf
    • https://cdn-cms.f-static.net/uploads/4453332/normal_5fda72ba2159f.pdf
    • http://tipofeliluget.medianewsonline.com/31268077280.pdf
    • https://mokowevabib.weebly.com/uploads/1/3/0/7/130739664/vurixaxekenagoji.pdf
    • https://wibixebaroz.weebly.com/uploads/1/3/1/8/131856543/9122cb5.pdf
    • https://static.s123-cdn-static.com/uploads/4493888/normal_5fddd5248dd33.pdf
    • https://cdn-cms.f-static.net/uploads/4452398/normal_6037d699b0efb.pdf
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/duraxamebazalok.pdf
    • http://neriwor.medianewsonline.com/how_to_download_paint_in_computer.pdf
    • https://cdn.sqhk.co/jaziwuke/bjfmihT/goxokagafizulagox.pdf
    • https://bubafoxir.weebly.com/uploads/1/3/0/8/130874260/silusuruti_norujajij_nabinet_supiwuru.pdf
    • https://cdn.sqhk.co/tavolimogid/iq6ibKH/tumblebook_library_app.pdf
    • http://jorowijedo.mywebcommunity.org/pigesifutuzisuvov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babetafaperaxov/bodeta.pdf
    • https://s3.amazonaws.com/kiremefegonar/argument_essay_template_gre.pdf
    • https://s3.amazonaws.com/dufekifaral/angular_2_form_group_value_changes.pdf
    • https://s3.amazonaws.com/dugibabafod/bezen.pdf
    • https://s3.amazonaws.com/muvazi/their_eyes_were_watching_god_chapter_16-20_summary.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e985.bin
427970418b4f2153effe4b1b514c9f3c24b3e39fe3c3de23cc82ebb38dd707da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 4956 bytes
font_01_sfnt_off0000fa77.bin
90ef97e9121ccfd01391f21438e9605586cb3c8e5e6be29468158b2aa9a584dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 10596 bytes

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