Malicious PDF — malware analysis report

Static analysis result for SHA-256 634916165c16a36c…

MALICIOUS

PDF

79.1 KB Created: 2021-01-29 21:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c89532ea2c64159a509adfe41b4e559c SHA-1: 15ba1c4d8ecdfe799478abad84c03322f39c4476 SHA-256: 634916165c16a36cb44157453a31b23338b534884ed73dbc5d0449fbd2210ec8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains including 'jottigo.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites.

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 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://jottigo.ru/123?utm_term=aves+de+puerto+rico+y+sus+nombres PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419195/normal_5fcb35dbc1b96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_5fe52acf2af2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403674/normal_600d4637083e7.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/47345864865pgek8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_5fd7ee7cb5863.pdfIn PDF document text
    • https://losirasi.weebly.com/uploads/1/3/0/7/130738883/tazesurovezot-mewupefexeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_601108bd52205.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/zijivevip/phet_isotopes_and_atomic_mass_worksheet_key.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/service_aggregation_platform.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/arashi_don_t_you_get_it.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/je_vous_informerai_ds_que_j_aurais.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/carfax_damage_reported_to_front.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/aflac_cancer_wellness_claim_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/7074272442.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/vamasafumidedeni.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/32928869232.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_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 5268 bytes
SHA-256: 88e67aa144ed2814d84c40903f6b7289ad6c9e1d37f0f1387cf13153e83c3f66
font_01_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 11528 bytes
SHA-256: 7fd1d25226698e7fff86c3b296761b9ccf8c6b2db95fa23426d9487a23546e9a

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