Malicious PDF — malware analysis report

Static analysis result for SHA-256 827c799e5897083b…

MALICIOUS

PDF

106.5 KB Created: 2021-05-01 15:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4e6c86b5a4fdbde2363a8d8a75bf6a35 SHA-1: 1590d8684f0a27f5894a37c131c908e4a1a4f4d0 SHA-256: 827c799e5897083b98daf4bec522bd3b8668c2d50836050dbadb52d9c03b2e2a
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 0.9991

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://ponafet.ru/strik?utm_term=juego+online+hombres+lobo+vs+vampiros PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424400/normal_602707aad8df3.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/10143729975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470692/normal_60471b3aa88ce.pdfIn PDF document text
    • http://midadef.iblogger.org/roll_over_to_zoom_troy-bilt_gasoline_edger_25a-516-766.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/brother_hl-5250dn_manual.pdfIn PDF document text
    • http://suvekitubexeso.getenjoyment.net/93683032042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_604df5288b91f.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/important_days_in_malayalam_download.pdfIn PDF document text
    • http://xelirap.22web.org/th_tc_cp_c_o_form_b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_6044f5e88f56f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_600eed5f6e4eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_b737f8676ca44fc8a6cc51abff66e9df.pdf?index=trueIn PDF document text
    • http://nixefumov.epizy.com/54954961071.pdfIn PDF document text
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_b6088a8fed5b4ef49e8a9f94a3a0553f.pdf?index=trueIn PDF document text
    • http://wutesejib.onlinewebshop.net/sanowu.pdfIn PDF document text
    • http://jitoritobo.epizy.com/sort_column_in_google_sheets.pdfIn PDF document text
    • http://tujatubaniza.epizy.com/fokiwut.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_bf6b5db90426443f9c3582829c983de6.pdf?index=trueIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_f0386a5e657343138da8a73679570761.pdf?index=trueIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_bbedf0bd5f554e0b994bd7d0fe128dc5.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_45cda70f18ce40b1b81400b51fa0e4b5.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_ed24015868ec47ed85bf705280c8650c.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_1b3b34ecf6654e9599cbe7a0fce73a74.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_0b1f501f2c714fb988c0a303c10b38f5.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_2dba85c8e3ef45268ca74ca0a80f9596.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_off00015afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AFC 5424 bytes
SHA-256: 205ee6bad0bdd0b424165f91f4db19ded33063fb6714bcd7cc2d6a251dc341fc
font_01_sfnt_off00016d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D42 15552 bytes
SHA-256: d68a1db56059dbadfa02788936e4cc19a725f87be2bede6490396bf3d17826dc