Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4f7cdefdea3e4f…

MALICIOUS

PDF

78.4 KB Created: 2021-02-12 21:29:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 08a5c085be9b73ecebeacf6a63701c55 SHA-1: e1629f777e88c876199d496838abbe76f5278f0d SHA-256: 4e4f7cdefdea3e4fff0d8a8d451fa78b3cc91ee9b233aafffd2e76797163a75f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/123?utm_term=russian+alphabet+handwriting+pdf PDF link annotation
    • http://tradestaroffice.com/o_pequeno_principe_filme_online2behd.pdfIn PDF document text
    • https://gukujevanedin.weebly.com/uploads/1/3/5/3/135344472/kinomumatu.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/30382124268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456399/normal_5ff7ca70011a1.pdfIn PDF document text
    • https://dibevapanowodi.weebly.com/uploads/1/3/0/7/130776811/gipoluxuxibotemix.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/jfif1su/biropiriso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_5fd98e558f4f3.pdfIn PDF document text
    • http://myirn.icu/project_cost_estimation_template_free66msn.pdfIn PDF document text
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/97a08822152304f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_600da51491f1f.pdfIn PDF document text
    • https://cdn.sqhk.co/bamewimoxatu/rGjcwzl/20407631267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470841/normal_6013f242106c4.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/qVgczie/ravensburger_labyrinth_game_limited_edition.pdfIn PDF document text
    • http://barekokodigak.iblogger.org/bootstrap_form_register_template.pdfIn PDF document text
    • http://hamlikjorettoop.ru/45735316492ufgw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465144/normal_60254ce6a253f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474448/normal_6017be6a3add1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapureju.epizy.com/59555591316.pdfIn PDF document text
    • http://pevivudawof.epizy.com/23246535606.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_off0000e755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 5540 bytes
SHA-256: e75bca47aa97a07774432f12d1c8a8f4b469d9d7494582ef99ea9ecf8babca01
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 16448 bytes
SHA-256: 2c8cd0950ed9128452516b01002d324b1703192e07c3b29502e517fb56cee1b5

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