Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77076c69d976cac…

MALICIOUS

PDF

88.1 KB Created: 2021-04-27 11:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2615c9c8c012fea56a125210965f2ce4 SHA-1: df7b1e7a5f501c048d6695a87792766fcf9ebcd5 SHA-256: f77076c69d976cac71336f360bbe3abfbbd6d0cda525b8375a7bec06376a34e8
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 operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=troy+bilt+super+bronco+parts+breakdown PDF link annotation
    • https://cdn.sqhk.co/fogunivugame/a1ijgfX/kulofinedegebafixibexamev.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/jjgcAid/opinions_columnists_articles_and_newspapers.pdfIn PDF document text
    • https://bokakarepexopo.weebly.com/uploads/1/3/4/7/134750167/737204.pdfIn PDF document text
    • https://wobereresexo.weebly.com/uploads/1/3/1/6/131606335/6757371.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/gidaiaN/tie_dye_party_kit_michaels.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/5019767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5fd2ff73da7d7.pdfIn PDF document text
    • https://cdn.sqhk.co/luvunugoz/mYjbhbl/34604201504.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fe29bb213cac.pdfIn PDF document text
    • https://cdn.sqhk.co/jefulajidi/6gcjbeM/kuwosusikumutixekob.pdfIn PDF document text
    • https://xajaxosu.weebly.com/uploads/1/3/5/3/135304217/gijirika.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/7995977.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487906/normal_601ee44c66bb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nutajowaga.rf.gd/37204240471.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/nios_dled_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/gap_analysis_template_health.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/tattoo_aftercare_advice_sheet.pdfIn PDF document text
    • http://juzudine.rf.gd/galvanised_sheets_dublin.pdfIn PDF document text
    • http://limufewugewo.rf.gd/dedunemisa.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/76334315021.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/21263823575.pdfIn PDF document text
    • http://vazujobanipixob.rf.gd/29520625829.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_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 5412 bytes
SHA-256: 489765fa97f9c2c63770289c731599c5b73a8f16c399a5b9a323dbba69cd42d9
font_01_sfnt_off00012dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 10924 bytes
SHA-256: 90d14f9860b65aaa852270e055839d0add8b4104cc06bd89c982091972d148c3

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