Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8eb5c570349b38…

MALICIOUS

PDF

79.2 KB Created: 2021-04-06 05:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9b3b0cfcd9c77c5102fa58325e5b6e7d SHA-1: 5f2f61dc7e2b84aa346a5b23262f73f3c96e2fef SHA-256: 8f8eb5c570349b38f09cf76b78b4a6dd005cda6487dcdbbe6d570077251fa153
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/wix?keyword=hardy+weinberg+equation+pogil+answers PDF link annotation
    • https://ripaduwik.weebly.com/uploads/1/3/5/3/135311581/vurotukipuvuxugipava.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/a_better_way_to_pray.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/greek_mythology_stories_ks2.pdfIn PDF document text
    • http://sandwichhq.club/what_is_remington_700_adl_bdl_cdl5ht98.pdfIn PDF document text
    • http://muzomabavima.medianewsonline.com/hr_assistant_job_description.pdfIn PDF document text
    • http://cosmeteca.com/kirugugikajodubutegulqm45.pdfIn PDF document text
    • https://lozibojugor.weebly.com/uploads/1/3/1/0/131069840/julinate_gesakuduf.pdfIn PDF document text
    • https://lukumupanulafaz.weebly.com/uploads/1/3/4/6/134683212/diwinubumukumopiwab.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/3e53d0168.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/32574233964.pdfIn PDF document text
    • http://temilops.xyz/renabujoporisohfomt.pdfIn PDF document text
    • http://cardioactiveufficiale.site/terraforming_mars_corporation_card_tag5dai2.pdfIn PDF document text
    • http://delojenopow.66ghz.com/baxifilineget.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/c9371642-4635-459d-bfe8-8828200bab7e/fuvomuzevosip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6da5da70-f600-4717-8854-f97f87920159/learn_spoken_hindi_online_free_through_english.pdfIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_8f5acb0e673c4e27a8d67ece0d073cb6.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_da4bc0411a674988bad41a00299e3996.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4358594-3f93-424a-84f5-259528d73d93/best_free_star_map_app.pdfIn PDF document text
    • http://tunawumananedi.rf.gd/35950984354.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 5548 bytes
SHA-256: 6bac3dbeec321b2b4f10b762ec294d330841dce892f7a4aa42a24fa9efd094fd
font_01_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 10560 bytes
SHA-256: 189cebf66212e63d66560095e07c6cd7b52178498076b99c8259106baa72aa54

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