Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5bd5941a930412…

MALICIOUS

PDF

76.9 KB Created: 2021-02-24 02:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 7fd56af392567822ab68da3cfe69dec5 SHA-1: 237ae2d4145401e663a415ef270e7a46c96940ed SHA-256: da5bd5941a930412aac1e149bffa46c81be5c9fe561fd187010a8dd003ec0d5c
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://bologen.ru/strik?utm_term=souris+logitech+g900+vs+g903 PDF link annotation
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/3f551d4ec.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/2438be18495.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/1181438.pdfIn PDF document text
    • https://tupodawemizaz.weebly.com/uploads/1/3/4/5/134594588/845127d.pdfIn PDF document text
    • https://cdn.sqhk.co/vomofizog/KQSgink/290635026.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373985/normal_5fec348805a6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_5fe6b18d42835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_6006975ae2e70.pdfIn PDF document text
    • https://woxisuxifajise.weebly.com/uploads/1/3/5/4/135400236/e9e1e3209c42f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366028/normal_5fff377ef1029.pdfIn PDF document text
    • https://sesanejaw.weebly.com/uploads/1/3/1/4/131407178/3d528.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/bc6d3fb6d2213.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gazitif/crib_sheet_set_gold.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/wrong_turn_hollywood_movie_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/pedijisoduvoje.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/wedokiteseniluzofek.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/inkling_boy_hat_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/likodawilojaxesezurokev.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_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 5476 bytes
SHA-256: 4c0037b8857d332e6cf9159393ea23703ef17e21b04d8039f65c540ea81a6d7b
font_01_sfnt_off0000fe5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 12404 bytes
SHA-256: b3d9e310303f6a17771301bcf638050f80bcb155266d232d11feb7a828eef6a6

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