Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4fbca772702691…

MALICIOUS

PDF

80.4 KB Created: 2021-03-23 12:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed91a40e0f0f6746dfe63bf3d71cf908 SHA-1: dffcdd3f0a2c7de029390ffe399d9dcc4dd9da84 SHA-256: bf4fbca772702691580f4eae4ae79b6e3dc12cfae2da13f3558aa1d6981544c1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with a critical heuristic firing for a PDF link farm. One of the external URLs, 'https://botokaw.ru/strik?utm_term=can+co-trustees+act+independently+in+oklahoma', is flagged as unknown reputation and is likely part of the malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=can+co-trustees+act+independently+in+oklahoma
    • http://tublitalia.space/1537573293lnmpf.pdf
    • https://cdn.sqhk.co/lomasamube/he0sv0q/35063841176.pdf
    • http://arenda-comp.space/att_uverse_dvr_no_info_availablemiad4.pdf
    • https://cdn.sqhk.co/vibifexode/hnhhAja/80879775026.pdf
    • http://pifemukopisare.sportsontheweb.net/pajutukepese.pdf
    • https://cdn.sqhk.co/kitujesijak/hbbghgc/art_masterclass_with_claude_monet.pdf
    • http://zonitupupafof.sportsontheweb.net/pdf_split_ubuntu.pdf
    • https://cdn.sqhk.co/koxuzofu/dijQgiv/jisesinajomuzegubose.pdf
    • https://cdn.sqhk.co/pevukoza/AhjFbia/duzekaguzizipatel.pdf
    • http://derilezin.sportsontheweb.net/how_to_grow_my_own_potatoes.pdf
    • http://wefilevazobakeb.mypressonline.com/1478238900.pdf
    • http://zumepaposakuf.scienceontheweb.net/complete_estimation_and_costing_of_residential_building.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/sinamozagemoger/corporate_website_design_templates.pdf
    • https://s3.amazonaws.com/lupuvogotog/which_bones_are_formed_by_intramembranous_ossification.pdf
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_f49d4f62a4274808a6495debb2031034.pdf?index=true
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_c15a985222f74275bc4776a3e1173964.pdf?index=true
    • https://s3.amazonaws.com/zulezov/happier_ed_sheeran_music_sheet.pdf
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_12a0048bff9e499093fecc54071c6fad.pdf?index=true
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_d3d60831cfe748f3ad855ea1759a74c0.pdf?index=true
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_2fb7ad92cde743b8944e9303f1e59905.pdf?index=true
    • https://b01cffea-7a05-49e8-9781-04202a21c04b.filesusr.com/ugd/d5d855_382b3a1380874dd2a1b586701ccae620.pdf?index=true
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_3cd74fd8abb5408c8001fc9097014dd3.pdf?index=true
    • https://s3.amazonaws.com/lorerexeg/petafigadenonarevab.pdf
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_f53ac733d0eb4d7d9564390adec03746.pdf?index=true
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_487ddd9e116c43ceb6b28d5dd2ef88da.pdf?index=true
    • https://s3.amazonaws.com/wuvepilamamuse/34815502965.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef2f.bin
16b684b499426e3f8dd889480c167d1091e68ee83c1b48b089db084b6983dfaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 5416 bytes
font_01_sfnt_off00010176.bin
7ce933c73f45c01426a804b8f6c30c79f7177d02266b82f7231db3f7781fd524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 10680 bytes
font_02_sfnt_off000125bd.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 4324 bytes

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