Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce8c0a054db9d92…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 05:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75e13107b004871b0777c0533e176329 SHA-1: bb79e825cfaca23a6c1a2755f9f09fd15d8a8b6b SHA-256: cce8c0a054db9d923e4725c0390fd0a3c18c1af66ce0d6d2799cdd057c5a813d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized URLs, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crophysi.ru/award?keyword=exceptional+children+an+introduction+to+special+education+pdf
    • https://cdn.sqhk.co/tobipamu/Bhhggtv/fesulukoxedimafumozujoso.pdf
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fca4895510f1.pdf
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5ff16f3b92689.pdf
    • https://static.s123-cdn-static.com/uploads/4424376/normal_5ff0c506ac989.pdf
    • https://cdn.sqhk.co/dutudovajud/c1eJra0/ho_slot_car_racing_videos.pdf
    • https://cdn.sqhk.co/jasowipe/i5ibWQt/zig_zag_run_benefits.pdf
    • https://cdn.sqhk.co/lugizumevemu/csTUgih/emulator_games_ps1_android.pdf
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdf
    • https://cdn-cms.f-static.net/uploads/4421049/normal_6021c909a5e11.pdf
    • https://cdn.sqhk.co/sivumazudi/dFaiaig/47199373264.pdf
    • https://cdn.sqhk.co/nodezaneripe/2oigjjA/murder_mystery_novels_for_12_year_olds.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d1e6aceb-f258-402f-b59e-92ecb386693c.filesusr.com/ugd/2cc58f_ff388044fac145b3b6ad0226c301962b.pdf?index=true
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_16a7b75d018b47edb899ff01d8957e9a.pdf?index=true
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_1f55b060730c43df82cd5ad7c7d102c8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7283c790-0601-4a3f-a5c1-3d3c1fe74fea/xubijazonako.pdf
    • https://uploads.strikinglycdn.com/files/e92018a6-3b00-44e3-aca4-da230cc6703f/21346163817.pdf
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_c2b2338c310e4cde970adb90dd134a37.pdf?index=true
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_0f75f12ad06a45fdacacf826fac402db.pdf?index=true
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_0d0e5dab04b4430a9103805d9b26e7b0.pdf?index=true
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_4802734fc15b4606b5a9952619d891eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1a6adc0b-da0d-4de1-8a06-246cb28f9c4c/51677132254.pdf
    • https://uploads.strikinglycdn.com/files/c2520c13-1d88-41cc-89d7-ba98887616af/81928156663.pdf
    • https://uploads.strikinglycdn.com/files/1aeb9d6a-6056-4356-aa04-65ff2bfeee22/jelatogud.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_off0000f0f3.bin
5ede01eb8507abe0b6119fd0b5fbf5dd892c7448a60803fdd23c7ec43c423004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 5268 bytes
font_01_sfnt_off000102db.bin
b20428ff1bdf3b8539cf92a803af2f990e2cb62158465f12f0e57973a2ae862f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 10560 bytes

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