Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0d84ee5d011c6f…

MALICIOUS

PDF

80.9 KB Created: 2021-03-23 15:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9a42160581cc8130ce8e035019b17c62 SHA-1: 2db7b7310681be9e97b952a660fca6c84f35953a SHA-256: 0a0d84ee5d011c6f14a0a521915dea9809e3b2d90318148f6522ac15551470c0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including one pointing to 'https://jacksth.ru/strik?utm_term=which+is+better+ai+or+ml', suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a malicious intent related to link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=which+is+better+ai+or+ml PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367303/normal_5fca79b5e9327.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/DJtjfjh/dupezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_60111b8bd4407.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fdf293ec3367.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/jc9ih95/96148965793.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuzopat/jahchfO/fireman_hat_crafts_for_preschoolers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fe89cb300db0.pdfIn PDF document text
    • https://cdn.sqhk.co/dezosanag/Srifge2/joresilojapobevura.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2977f7-79b6-4cc5-9613-e230bb4a3e5c/tovotojodikesukeluzod.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_31f757be4b3e4264a14738766ad8b885.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_ef7a8e0d5b254061a05b3030df6fa897.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_f1b470d845fe4785aaa094a026c54458.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f1c20c4-6620-4d6c-a3aa-2d1e47518a71/91561889730.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_7fba20aa9d1240f28703822f113cb276.pdf?index=trueIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_ece1b6d69bd04c44a8b46ee005140b17.pdf?index=trueIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_2ea449c2dfcc43d1a24a7412e93004ff.pdf?index=trueIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_89785abc62ff4a0e8f860ac529bcc097.pdf?index=trueIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_a0fe0e6f779e427097e7f92cf0c30e69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3617a6e-9eab-4363-bd0b-8fe69cf8c086/how_to_factory_reset_disabled_iphone_6s_without_computer.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_de93a901955e420db5d37f65552eacc6.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_692292b5586b43feb6540f37a60c6a29.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_f4ef8678e99a4fd9b387ae4a5dc5c5ed.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_bd474b3c4bad4d0280bf17f46f1616a1.pdf?index=trueIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_f2b512b11b26445a97327bb7632608d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebe6bd0d-0ef9-4346-90eb-fcfc6b49c140/ms_all_de_los_sueos_libro_completo_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0954a92b-f1ae-4591-8d9b-26de7aadd3d0/using_a_reflux_still_to_make_whiskey.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 5192 bytes
SHA-256: 47c9d47555f2eb41a44dff85fc9b5bd6888ffe479f0ebb9e6bcf1645a856a4b3
font_01_sfnt_off00010e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8F 11276 bytes
SHA-256: 98572bf2ee878b13eab23cf9b945d4c93e2cf90169953de21970f69dc00347a6

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