Malicious PDF — malware analysis report

Static analysis result for SHA-256 559e90b2b8b43abe…

MALICIOUS

PDF

75.4 KB Created: 2021-03-31 14:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1bd98748af294c858d23db1d923897da SHA-1: a4b232fb1e0c50f06ec1adeda5f30b8145eaf417 SHA-256: 559e90b2b8b43abe530eb68827046d4a8672671724cabb589df5327d5a475ce4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://seumenha.ru/wix?keyword=troy+bilt+6000+watt+generator+weight PDF link annotation
    • https://sibolapitabake.weebly.com/uploads/1/3/4/4/134469628/5261273.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/how_do_i_file_aflac_vision_claim.pdfIn PDF document text
    • https://pebajubidu.weebly.com/uploads/1/3/1/3/131383648/03e7d.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/1878335.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/detapagurizizagevix.pdfIn PDF document text
    • https://tikepewovexa.weebly.com/uploads/1/3/4/3/134317170/160cdf291.pdfIn PDF document text
    • https://zemapefim.weebly.com/uploads/1/3/4/4/134485651/3475757ca4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_0867c6f3fd624a99aa3b53408fd533ce.pdf?index=trueIn PDF document text
    • http://fuvamawijivef.atwebpages.com/9693261834.pdfIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_2dd9a8e562cf4da48f4bd404ef04c869.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_9cf8e9d94def4f22940409b5a64b4dd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b623040-81b5-4fae-8735-aada893b86b0/risasudileluz.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_133d4f73aa8c4c56814b12cf309785cb.pdf?index=trueIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_d514bf54edda4398afedc8891269f81a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d033ca-4814-41f0-99e1-0d8bd2d4a48d/xolesojemamopite.pdfIn PDF document text
    • https://c4647614-9ff8-4b00-b819-08dc938bd166.filesusr.com/ugd/5d3f24_ea2c1930528c463b897227a06d2f2acb.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_337a5172077145cbab4fd7b9a39d2c37.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_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 5348 bytes
SHA-256: 68d70fabe1bddda82697393415469dbc4c5686be52a74d800d245aeb8aab3f6b
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 11624 bytes
SHA-256: ce63780871292e07e09adbc662129bb69415be8e059eb41752eabcf931e3af29

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