Malicious PDF — malware analysis report

Static analysis result for SHA-256 2095ed2d4834ebbb…

MALICIOUS

PDF

99.6 KB Created: 2021-03-30 16:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7ec2bb78753f45dd51f106d3173a78a1 SHA-1: 63651c70d7680a565d4a560e5a80c2890baf5c87 SHA-256: 2095ed2d4834ebbbff4ec8b68de4199b0e6f6c959caea371102085a4d3cb65c8
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents, likely for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_LINK_FARM heuristic identifying a large number of external links, many hosted on disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=anthropogenic+sources+of+air+pollution+pdf PDF link annotation
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/danexurekos.pdfIn PDF document text
    • http://naykaryadom.fun/8516476422ckb3l.pdfIn PDF document text
    • http://tgesheff.xyz/1795245104703dqk.pdfIn PDF document text
    • http://profmaster74.ru/how_do_you_use_the_vintage_presto_pressure_cookerxe792.pdfIn PDF document text
    • http://giocodigital.website/lexus_gx_460_specs_2014ad2kh.pdfIn PDF document text
    • https://tuxotise.weebly.com/uploads/1/3/1/3/131379496/2225543.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/0c451cf0-23cc-4e07-84f7-76afc697ed47/kojadune.pdfIn PDF document text
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_4813352a3ff24058860c4502059e3c2e.pdf?index=trueIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_f5ad45f44c624e34ad5085b20337c14b.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_0402b93b4f634c02870bc909cb01f2a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/161293f2-f6d5-4211-82d4-db03ce818ade/fulojivijorit.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_fd7cc1e45c1442f6a342f5b09f3234dc.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_30bfc1fd90b64396866d644bd1aba539.pdf?index=trueIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_ba6b95e80176462c903a20f98c731a40.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9182929-0535-4d3a-a813-4c290069e1ad/jikapomawenibo.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_d5bdd843a968414ba9343accd4cef5b9.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_b009f48e13384860b90ac2b4427b9758.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_7341b2f6841a468bb33d552c881adc8b.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_367eaf110db0475f8570f40b7b0704a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f452d38-0785-4d1c-bff2-afae1e5e89dd/what_is_standard_economic_theory_mean.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_b249c6a2d3e34c878e338c12efdc94f8.pdf?index=trueIn 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_off000146b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B1 5408 bytes
SHA-256: f64449e0c7af6d3a9a27ce34c718d866363649795b5324eac5107e41fbf3a979
font_01_sfnt_off00015915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15915 11796 bytes
SHA-256: e7bdef53180bdf19a5dce6b5e270855330a091fc097a6aea00c66b36c56ac472

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