Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51f4a6901d87c4d…

MALICIOUS

PDF

110.6 KB Created: 2021-03-23 21:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0876b22d11fdd10731b9eada88f245f SHA-1: 76bc83018b38ada03e80e194cc71abb743fd3af9 SHA-256: e51f4a6901d87c4d5e7aff971d4be0a14d06e6291d9a24ceeb4f1c0709fc6651
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with the primary URL being 'https://jacksth.ru/award?keyword=ajaya+book+pdf+download'. This heuristic, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://jacksth.ru/award?keyword=ajaya+book+pdf+download
    • https://cdn.sqhk.co/gulifunanale/L5uhjhi/cyber_hunter_discord_free_coins.pdf
    • https://cdn.sqhk.co/rorefevobo/7hehfgh/my_talking_cat_download.pdf
    • https://cdn.sqhk.co/vimexuda/aqLqhhK/cake_decorating_store_in_phoenix_az.pdf
    • https://cdn.sqhk.co/nivurerazusa/jgdDH6m/3171150287.pdf
    • https://cdn.sqhk.co/tomubozes/YSB80jf/duvukobusewudiz.pdf
    • https://cdn.sqhk.co/faserekino/2RuygeX/storm_racing_drone_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0f2f78ec-3959-44cd-b36f-0f930d9ebec4/rujeminukukuveberofebitus.pdf
    • https://uploads.strikinglycdn.com/files/6a44be4d-2fb2-428e-bde6-e0fa863becc8/84950905182.pdf
    • https://677f84e8-2a3b-482a-8721-58d714100356.filesusr.com/ugd/086aec_0d4a04f2a3464568bb91692dc623821c.pdf?index=true
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_c679c5529aed4dfdaac4b6b40271e5e5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7648c40c-8ee9-4b02-b59c-179f472b31a7/ayat_alquran_tentang_riba_dan_jual_beli.pdf
    • https://uploads.strikinglycdn.com/files/8d72ad21-b941-49e4-ac08-ae6798ff1bfb/star_chart_app_android_free_download.pdf
    • https://uploads.strikinglycdn.com/files/1c7e257a-b7c4-4943-bed8-e8538908d676/boss_tu-2_bypass.pdf
    • https://uploads.strikinglycdn.com/files/343d4fb3-3c0a-410c-9352-a76306da19a4/14415975816.pdf
    • https://uploads.strikinglycdn.com/files/2e8afcdc-3077-46fd-8b3f-d04a06aefa35/menenuzemime.pdf
    • https://uploads.strikinglycdn.com/files/fa44da85-21c0-4321-bd81-f7cf2fb1834c/xevowajixazamamilubef.pdf
    • https://uploads.strikinglycdn.com/files/5584dca3-ba83-4e41-8fa6-553384daa6ef/32282029494.pdf
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_08a16860431e48a393d7c9af6d18d978.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bbba8337-ea7c-43bf-b520-b3f3361a8ac4/kibapuranotigu.pdf
    • https://uploads.strikinglycdn.com/files/35b80871-b6de-4510-9ae5-e5ea6bb752ca/96233348166.pdf
    • https://uploads.strikinglycdn.com/files/d9ebff29-4b51-444a-adc7-aebdc077006f/49641297517.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_off000172e5.bin
8ec161ffc93c7bdbf0be9d6c7dd179a84b5445971733e41b5e53a963f07cb4db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172E5 5224 bytes
font_01_sfnt_off000184df.bin
b86d7ba495c792188b1e3fddcf4dde13f50dd7bce614c3c1dac7d496ee298521		 pdf-font-stream PDF embedded font (sfnt) at offset 0x184DF 11816 bytes

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