Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6854b4840cac28b…

MALICIOUS

PDF

71.2 KB Created: 2021-04-05 21:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64ae53be19360dd15397537a6a976863 SHA-1: ee51a98fd84c2cf55c12a8a2f3bcb8baa56cc11b SHA-256: a6854b4840cac28b7a98361ea3cd30395cec972e1a6a3a5c628c35420ab96e59
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites, as evidenced by the 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is https://jacksth.ru/award?keyword=principles+naval+architecture+sname+pdf, which is likely used for phishing or distributing further malware.

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=principles+naval+architecture+sname+pdf
    • https://zejikato.weebly.com/uploads/1/3/3/9/133997407/6339428.pdf
    • https://kilewesiviteki.weebly.com/uploads/1/3/1/1/131163613/e056f96dcd5.pdf
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/mibusarekofazof.pdf
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/zusolel_kerezipifunufe_pisodajijipom.pdf
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/duzifoluxep-bakalufulivivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2105e620-ae83-431e-9a1e-d654bee63f2b/62997460613.pdf
    • https://uploads.strikinglycdn.com/files/b4e83c90-9221-40e5-9289-13982af52053/mesezafagotagizutovadef.pdf
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_a4c94c24e1ea4ffcaa2167a19660c9fa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/13863c27-9848-4f8f-8b05-3b53b9439cb6/86506350135.pdf
    • https://uploads.strikinglycdn.com/files/60132cf7-b8f3-42f4-b4c8-e60863820b84/69050068732.pdf
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_31367adc4d4e454da70f9cc4d9a47825.pdf?index=true
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_011c29e9eff043edaf21f9e7282d92b2.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_bd17efeb36a14311832f2405c0115307.pdf?index=true
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_b494aece36aa46b2a9c085561a6e3e19.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_35c823076e9e42a1843030fd83bf08f6.pdf?index=true
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_e78141cd46fe45c8915caecddf6ad2d1.pdf?index=true
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_51a944a349df45968a3ded64f2efdf8d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e61c252-44c1-4c8c-878a-0496b130b94d/27045888184.pdf
    • https://uploads.strikinglycdn.com/files/875fc304-9fe4-42e9-99e9-a59794932a18/the_game_awards_time_california.pdf
    • https://uploads.strikinglycdn.com/files/584c96c7-7485-4b2d-b258-4b1a43723595/34018134524.pdf
    • https://uploads.strikinglycdn.com/files/91690639-c293-4a87-bf8d-23d1135f8fac/journey_to_the_west_monkey_king_movie.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_off0000d5de.bin
a2ec833e17eeaf7ebf130cf2ae46bf62cdf6557b44e7c254bd4d62fc2f1622fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 5456 bytes
font_01_sfnt_off0000e846.bin
1a1211be9f67ff06f6bfc90e1ccfe19e8c1e64b650cff391b7fc644f34dbb2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 11356 bytes

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