Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e9f097576851a7…

MALICIOUS

PDF

81.6 KB Created: 2021-05-03 16:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d831d73d2ac5fa3dc283893f4c8c2e71 SHA-1: 8b2841ac180ebaf6da18349ccf53d164c320fc6f SHA-256: 58e9f097576851a7b5750c14cad0360ffb4a6def2f48c794d563de0c144e6c10
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, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://lozipotod.ru/strik?utm_term=reading+comprehension+exercises+with+answers+for+7th+grade PDF link annotation
    • http://kavademive.sportsontheweb.net/taurus_pt111_millennium_g2_9mm_pistol_review.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/772328238586gt9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_6065b4a416b9c.pdfIn PDF document text
    • http://normab-id.com/verbos_en_pasado_continuo_en_inglesr4mro.pdfIn PDF document text
    • http://copyrighytsupport.com/insinkerator_evolution_installation_video0desk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_60197da4245b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_6038b8eb9b04c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366366/normal_5ff964e728a2a.pdfIn PDF document text
    • http://weraka.online/fowuderuxuwifie5ocw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_602e6668b0b62.pdfIn PDF document text
    • http://mebel-albero.ru/17038014383vdmx1.pdfIn PDF document text
    • http://sodalabs.pro/410458492396pfwn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_b4b5a8877b6c4034a1f4034c6ed6e89f.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_86f9a1a0e80e4aab9ca43902caefdb5e.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_d6824acf2e2e41caa216aab7bc2ce0a5.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_6a45ee82449b403ca3650e74d5b81463.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_1beb00170cb741eba9fbc8664f8801d1.pdf?index=trueIn PDF document text
    • https://dc010c70-835d-4b56-8cb0-1e1bda7cab64.filesusr.com/ugd/fb576b_0cc6f1f2fd8948bd96c9c49288071954.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_48f731bf144240de8dea571668af59a0.pdf?index=trueIn PDF document text
    • https://314f4944-3dd9-45af-b5ee-fc7f46c963e4.filesusr.com/ugd/73cb9e_2587af74dd864b4d805e530810a8eeed.pdf?index=trueIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_6eb5cd8e38234628a1f8700f083bc875.pdf?index=trueIn PDF document text
    • http://fusozevukatamir.atwebpages.com/legosepixir.pdfIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_749af20e18254fee9f64f7f0a2e041c5.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_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 5784 bytes
SHA-256: e3b9a419ae258005db7edef5a0994022e767c01e4d23d133715483cec0ac7034
font_01_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 10928 bytes
SHA-256: 4fe64d7bac22ea41498fb355622bd14a6e5829c0f80578f589069c041c1d2170