Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5ad6fd55f164a2…

MALICIOUS

PDF

81.4 KB Created: 2021-05-10 07:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 853897c0c63617913628b5102de4f32d SHA-1: 2866b852363bb6e5e764bd58280b765319512c5f SHA-256: 6c5ad6fd55f164a2bca896fe9fd5bdc0ee516e13825c078ac4ad8813b74c03c7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The primary URL, https://nipisod.ru/strik, is likely part of this malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and the heuristic firings strongly indicate malicious intent, likely related to phishing or scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=how+to+become+a+certified+healing+touch+practitioner
    • https://xekanowodupap.weebly.com/uploads/1/3/0/7/130739303/8250572.pdf
    • https://fodirimuf.weebly.com/uploads/1/3/4/6/134621751/kinewifav.pdf
    • https://metasabuvaro.weebly.com/uploads/1/3/2/6/132681671/xajobamif.pdf
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/joxorelabafu.pdf
    • https://muneberixiloza.weebly.com/uploads/1/3/4/3/134339704/fekukizemolaxar.pdf
    • https://donefuvo.weebly.com/uploads/1/3/1/1/131164418/1faf85d3cffb.pdf
    • https://cdn-cms.f-static.net/uploads/4450501/normal_6063431a49ca6.pdf
    • https://cdn-cms.f-static.net/uploads/4380214/normal_600f3c5104aa3.pdf
    • http://kuliwajijet.22web.org/71545502867.pdf
    • http://girlita.space/cutting_paper_online_freeje8g4.pdf
    • http://lumurezekosarew.66ghz.com/software_aaa_logo_maker.pdf
    • https://cdn-cms.f-static.net/uploads/4466173/normal_602e84751603f.pdf
    • https://wanalupegekiful.weebly.com/uploads/1/3/4/8/134879682/8144451.pdf
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/2667271.pdf
    • http://kersita.space/once_i_was_7_lyricszcp3b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14cee39c-8081-445c-b23f-8b0a7530a616/igloo_kool_mate_40_specs.pdf
    • https://uploads.strikinglycdn.com/files/a09c2890-c34c-4272-8b28-3b3d363f001c/61789993503.pdf
    • http://ponowuvibux.epizy.com/lucknow_university_bsc_chemistry_syllabus.pdf
    • https://uploads.strikinglycdn.com/files/d8b9ffe8-b029-407e-8124-8c7a6023d9e3/kuvatuninopemofijaja.pdf
    • https://uploads.strikinglycdn.com/files/05c205d5-d0ad-4517-943c-e368a385a1fe/lojagazimagogitamufaxox.pdf
    • https://uploads.strikinglycdn.com/files/7a113252-ba06-4861-92bd-91c7b557e186/29041219967.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1e.bin
69a98b64969517e5a4ccaac1dfbdc581f6b6ae5e24cad74faf44509d7ac2b292		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 5584 bytes
font_01_sfnt_off0000fd00.bin
9a23491a0e6e4feaf1d9e61a0c6f4a6e601a36473e2a0613f4b0729caa1881f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 10952 bytes
font_02_sfnt_off0001227b.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 16204 bytes

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