Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c08ca94ae4f3bc…

MALICIOUS

PDF

81.2 KB Created: 2021-03-04 00:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 0cd1ec06495bafb8fd56123c0ce54014 SHA-1: e3cae079ddfbadafc5909b9f4ab0b1006122eacd SHA-256: 94c08ca94ae4f3bca79331fa99e2021817a20e97480a3830520de5ef7eae5628
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one that appears to be a search result lure. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=reading+comprehension+passages+with+questions+and+answers+for+grade+10+pdf PDF link annotation
    • https://nivewasivok.weebly.com/uploads/1/3/4/4/134479385/3534590.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477164/normal_5ff6318ebca74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_600fb0b027f4b.pdfIn PDF document text
    • http://setefigidoral.iblogger.org/aegis_legend_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413693/normal_6029df9b1d719.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5ffd54a0634bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_603f92ca0da54.pdfIn PDF document text
    • http://policyhelpcenter.com/atkinson__hilgards_introduction_to_psychology_15th_edition_downloadgnojd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_603b789ea461f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5fe4d5aebaadf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kizuwopo.epizy.com/acura_ilx_2014_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/60505647651.pdfIn PDF document text
    • http://zarenubopopo.epizy.com/personal_budget_spreadsheet_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/terapias_antienvejecimiento.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/company_profile_template_sample.pdfIn PDF document text
    • http://kagapari.rf.gd/sample_accomplishment_report_in_mathematics.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_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 5956 bytes
SHA-256: ad9a356b260cb1206cb06061d3d88be11c9068a6280c5190905c8e2e3372ad24
font_01_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 10976 bytes
SHA-256: 3523930babfd28b7dcfe319a48deaadcd45b3e640c06d1264f9d6d8c34335b30

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