Malicious PDF — malware analysis report

Static analysis result for SHA-256 304cc980af5b7cf2…

MALICIOUS

PDF

87.7 KB Created: 2021-05-29 06:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 86a613cf1f2e0b0853d5c678874583d7 SHA-1: 0c059bbde7f40f760e028d55e296b0607a38b3f4 SHA-256: 304cc980af5b7cf2c38acd53a7f60c7379876a232b0db026b9119ef127488e32
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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/strik?utm_term=how+to+calculate+metacentric+height PDF link annotation
    • https://koralazuvumo.weebly.com/uploads/1/3/1/8/131871516/nojos_roxij_jumawidugawik_jogoxukoxofe.pdfIn PDF document text
    • https://betagoguf.weebly.com/uploads/1/3/4/6/134668965/fezuzakotogelonamaf.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/6cd117ef60de815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_6041788fd27ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421471/normal_5fee05a5b6476.pdfIn PDF document text
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/5108296.pdfIn PDF document text
    • https://zitakutuseg.weebly.com/uploads/1/3/5/9/135994262/1285160.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/2fba57a.pdfIn PDF document text
    • https://vevitukag.weebly.com/uploads/1/3/7/5/137506107/biwulotume-wiwumimuzeb-besazexo.pdfIn PDF document text
    • https://nopufara.weebly.com/uploads/1/3/3/9/133999240/tejurabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423429/normal_5fd065407722b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_5ff943d5a94e0.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/62e4a09d-51b2-43c7-9d14-44cfb7ba1194/rifepedilukanuwuxezasetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47889ca6-83db-4dee-90df-53847c4132ab/envision_florida_algebra_1_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39768d98-edac-4389-9317-455ed367a2fb/ejercicios_ley_general_de_los_gases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e3709b-9388-4b22-896c-e35544cef2c2/dixixegoboresosax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad29e84a-2490-490b-9c00-3ff9d99f6eb6/ninonudobixexapemos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c98db31-83df-4882-a78c-28d9342bbf9e/29711828557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f2c5a49-ce0d-45b4-b84d-55b8c2119c6c/94080580490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ee8a46-ca12-49fb-b950-29e1bbf1cbd5/what_is_a_social_studies_elective.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a1cb36-5d29-4fd4-b91a-26c407d08f1c/25854334963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad10de86-a5cd-421f-8d4a-db38f85754fa/tamigiwakotisikotanan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9209c7e-9aa6-49a2-b6da-10f8fd68c889/kapagovananamozugapumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14e8135-2c8a-4ed0-b4f8-8eb912237572/93886170018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f271dd9a-f645-4f5d-a049-f42fa800ea0c/1_hectare__equivalente_a_quantos_metros.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 5088 bytes
SHA-256: a624b7eea868fbf03204ea8a331b5a61b5415d96ae246f83ef033326f3d44262
font_01_sfnt_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 11620 bytes
SHA-256: 8198be7eb8cc04f98842a727d0ebf5b5afcafa30fd2914e9e0fc231867884c44
font_02_sfnt_off00013baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAF 16064 bytes
SHA-256: 5355995778af6fea050508ce4debc46bc2ba7deab687ac039556469e1bec84fc