Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f419b21ebd9828…

MALICIOUS

PDF

69.4 KB Created: 2021-03-31 00:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 963ddc8da72678aa61fe141c6d9b4a2b SHA-1: 79ba169a220b79dd2e1547e60645915fab82ed03 SHA-256: f6f419b21ebd9828fb74fab226a34caa5ac9cc1133ce7b080a1b9cbed9e60c45
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms and redirectors, indicating a phishing or malware distribution attempt. The heuristic firings confirm the presence of malicious redirector links and a link farm, strongly suggesting the document's purpose is to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/award?keyword=harcourt+math+3rd+grade+workbook+pdf
    • https://xivupofe.weebly.com/uploads/1/3/2/6/132681771/vejiwarado.pdf
    • https://cdn.sqhk.co/sesijisova/46Mvagg/red_ball_4_unblocked_volume_4.pdf
    • https://cdn.sqhk.co/tezakagadol/eRniajj/annual_work_plan_template_undp.pdf
    • http://laribij.scienceontheweb.net/australian_citizenship_form_1300t.pdf
    • http://gililofus.medianewsonline.com/wepafemevebu.pdf
    • http://erethiztzj.space/714275594177wiix.pdf
    • https://cdn.sqhk.co/tigixexaxi/jihes4U/badap.pdf
    • http://lazirog.mywebcommunity.org/englander_13_nc_wood_stove_reviews.pdf
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/bebasovijap.pdf
    • https://cdn.sqhk.co/waxolulum/jjhgigc/kebovek.pdf
    • http://alisabor.design/wanawejovewugelugosf14q.pdf
    • https://nodaveto.weebly.com/uploads/1/3/4/2/134266094/sijozuso.pdf
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/b7a34080.pdf
    • https://cdn.sqhk.co/joxesinejag/iOiagdV/kejosumemifa.pdf
    • https://cdn.sqhk.co/wajidafix/gGFggij/motorcycles_for_sale_las_vegas.pdf
    • http://bikokobolo.sportsontheweb.net/basic_addition_and_subtraction_worksheets.pdf
    • https://rodawuliwunugen.weebly.com/uploads/1/3/4/4/134490897/xajavesaxudev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_814660ec8ac7455d8036e93e6122e053.pdf?index=true
    • http://peledopa.myartsonline.com/the_great_hunt_grand_tour_island.pdf
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_b9ab40e48a154a1d86f15ef3aeaa0241.pdf?index=true
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_80e454c3da7c4721a9a8d0ec0cb2a654.pdf?index=true
    • https://f867c6cd-7aae-4938-a634-6821dcb48262.filesusr.com/ugd/eb45fa_69a29db33b214fb3becea0d9c2481835.pdf?index=true
    • 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_off0000d1a8.bin
bbaf3d024b3321d901bfd23def68329d7259c1c48e1cad9cd6d498ac4acbe84c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A8 5780 bytes
font_01_sfnt_off0000e53e.bin
45c2ec5be34efd6e2b060d150a97203a27bff8b8b269771fd0fd034348434711		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE53E 10268 bytes

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