Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c6572f79fa1380…

MALICIOUS

PDF

75.9 KB Created: 2021-03-15 03:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ae61ad98c04de711fae0f4f0fb6c21ea SHA-1: e69251b8eb494a418e6ad69b98fd8abdd6654454 SHA-256: 29c6572f79fa13800b03a6f691bae60bb1cad7ca5a5cc37293de3470e1babc89
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=the+norton+field+guide+to+writing+with+readings+and+handbook+%2528fifth+edition%2529+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473031/normal_60387bcc0e622.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/probability_moment_generating_function.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366043/normal_5ffb0eb0c494b.pdfIn PDF document text
    • http://gujolumurufeso.iblogger.org/32421342076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459188/normal_601ed774e17b6.pdfIn PDF document text
    • http://suzamakulamuj.mypressonline.com/winerur.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/pediatric_advanced_life_support_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482023/normal_604e9a55c60b1.pdfIn PDF document text
    • http://ligumexijigab.getenjoyment.net/jadibopubelul.pdfIn PDF document text
    • https://cdn.sqhk.co/nisikevepoxi/b6NQkjd/hidden_cars_in_gta_5_online.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/past_perfect_continuous_tense_exercises_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/7sZKjjg/43810948587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_602671e3c1fdf.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/qib4pih/xavotefi.pdfIn PDF document text
    • http://jotusimemirido.sportsontheweb.net/95015547135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://legasefurat.epizy.com/urinary_acidifiers_and_alkalinizers.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/fedex_freight_bill_of_lading.pdfIn PDF document text
    • http://jufomotapi.epizy.com/indoor_games_that_require_no_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/charts_and_graphs_worksheets_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/rapofegaru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 5584 bytes
SHA-256: f4a40850eec10ed799e1333f0addd3fe94f9ac06935967226066a659d6e4513d
font_01_sfnt_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 11204 bytes
SHA-256: f21b895f16c030e79d4947f3ddababa8356ab9f4ce79381f10ae33c23923ba40
font_02_sfnt_off000110ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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