Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f6bc9a27bbe283…

MALICIOUS

PDF

88.9 KB Created: 2021-03-09 11:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c358c34588486f4f1c0bcfb97aa9a904 SHA-1: 2a94d8770620934e5506e30f8a1f42184de1da8f SHA-256: 46f6bc9a27bbe2830b8dc061de758bf3d8137d6b3a2d5ae0eaff3f04b4cdd1b1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/aws?utm_term=roland+tr-8+instructions PDF link annotation
    • http://alsamcctv.com/overloaded_sentences_worksheetsmpa9a.pdfIn PDF document text
    • http://solent.bar/u_n_d_p_ki_full_form0qkvz.pdfIn PDF document text
    • http://securityverifiedservices.com/1959941857e8uy0.pdfIn PDF document text
    • https://falitevegenos.weebly.com/uploads/1/3/4/3/134321562/xoboberuk.pdfIn PDF document text
    • https://revijokatise.weebly.com/uploads/1/3/3/9/133999222/142efe40ba54.pdfIn PDF document text
    • http://tonagruz.ru/guviripinusarilataxexams6lgo.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/6617774.pdfIn PDF document text
    • http://vigastlens.xyz/harley_service_cost_indiax5nku.pdfIn PDF document text
    • https://nasejanebuxilas.weebly.com/uploads/1/3/1/8/131856105/70b4f39a042d5e.pdfIn PDF document text
    • http://lnstagram-helping.live/yamaha_rx_v463_bluetooth_adapter1gzt3.pdfIn PDF document text
    • http://gazizelasama.getenjoyment.net/38920726837.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/d8432b6349.pdfIn PDF document text
    • http://vitrinachel.ru/free_network_plus_study_guidedprre.pdfIn PDF document text
    • http://uuuuull.space/95822974667zcccl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fusezumapaj.epizy.com/soundcloud_api_track.pdfIn PDF document text
    • http://xolisijepe.rf.gd/light_relief_price.pdfIn PDF document text
    • http://xidalagep.myartsonline.com/oreilly_free_books.pdfIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_5a3a6099cf9c4777b10c27f8cd84a02e.pdf?index=trueIn PDF document text
    • http://jiwositefikeb.rf.gd/wudinejomaxarugedulup.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_609b53cddb5349a0aa555685e1408a58.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_45391cef728b49f7a625e2e7a9b6a2b7.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_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 5168 bytes
SHA-256: 567f1fb8f712428d70537b3bab4e988415f36f2da502c6948fe81e8ecf08b92f
font_01_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 10948 bytes
SHA-256: a73c9c1cbea3d20f0903f6a5ff17ace4b6946578937c1fcb9ad8265b9d12fe55

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