Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f0ac4979e940dbc…

MALICIOUS

PDF

73.6 KB Created: 2021-03-25 09:13:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 960e59ed3e9493d0bf4bf6b0d22be77f SHA-1: 915d1c85351439e9002f44bc5a0f6e33f6380a01 SHA-256: 0f0ac4979e940dbc7ed1536a5e5157e052a4de7ff27127fa38c0f93211d8aa56
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The primary malicious URL, https://kuzutuzo.ru/award?keyword=adjectives+order+worksheet+pdf, suggests a phishing or malware distribution attempt disguised as a worksheet. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/award?keyword=adjectives+order+worksheet+pdf
    • https://cdn.sqhk.co/zebenane/whiNtxq/snake_game_worms_zone.pdf
    • https://cdn.sqhk.co/nimotixalulo/cjfoCig/trimble_studio_gps_software.pdf
    • https://cdn.sqhk.co/noxisoture/1ha1K5b/voxusinomovizatejokaz.pdf
    • https://cdn.sqhk.co/mewivupa/f5wiejc/vopikunojiwujujejoserexev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_161ac1a79d684d159c84fcae00173adf.pdf?index=true
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_e6721e3906874abb9237dd440cda1d19.pdf?index=true
    • https://eeeff038-21f9-42a6-bde0-cd945221d618.filesusr.com/ugd/9dc459_f05ef08aa5d74ae79c1589b2f6dd101e.pdf?index=true
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_f0ebbf69a3614daa92c4dca05c7e1462.pdf?index=true
    • https://s3.amazonaws.com/fizaxo/opportunity_analysis_canvas_third_edition.pdf
    • https://uploads.strikinglycdn.com/files/38bcab49-2189-4632-8aad-62fd03d24dd1/hp_laserjet_pro_400_color_mfp_m475dw_printer.pdf
    • https://uploads.strikinglycdn.com/files/4bf41adf-1b4b-49f2-ad8b-1406b015b472/26339144856.pdf
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_5b9f5f2edaf14ad790d3949dfc784ca0.pdf?index=true
    • https://s3.amazonaws.com/mexijegedakol/pajurovisiwisi.pdf
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_8df62ae7c99e4302a564c2148021b4ed.pdf?index=true
    • https://e9abb47e-19e5-4ec2-9f3c-2aa4e6f2bf0a.filesusr.com/ugd/92be99_af9854e372ee4dbda1105b7f3d0b7521.pdf?index=true
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_9e2b5030c6e04e9289c09843dddc26e8.pdf?index=true
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_3d2a6126d68f4dd595a5d8c364d3b692.pdf?index=true
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_21917601e5ad45e4bc4819e4eaf83834.pdf?index=true
    • https://s3.amazonaws.com/wezukep/lodomi.pdf
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_78ae8c39f5564672a39153114213f926.pdf?index=true
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_9a7fb84a247d411282b948b9eb9a5302.pdf?index=true
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_fedafb8d5982494b92ed1f4f33d9db95.pdf?index=true
    • 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_off0000d71e.bin
217e53ade7ca7c84212d81965755073eb6f917f5e9423bfe90075742b3046c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 4964 bytes
font_01_sfnt_off0000e831.bin
1d4650c801a024908f646555bbf225efca8995413ca3588e15729ec8aa5649e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 10244 bytes
font_02_sfnt_off00010b08.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 4324 bytes

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