Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c6be33a0b1bc12…

MALICIOUS

PDF

70.2 KB Created: 2021-03-02 00:12:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 325299448b7c40b6a854086f440bdfb6 SHA-1: 30f4d554566f8996ba2539d69aba218973adf1db SHA-256: 64c6be33a0b1bc12903b8e30e2a65cc7c5c5f5c9d1b9684205af7b9ab8020870
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying a malicious redirector and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the presence of malicious URLs and the nature of the heuristics suggest an attempt to lure the user to external 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=average+salary+for+product+specialist In PDF document text
    • http://vijexibat.mywebcommunity.org/are_sub_zero_fridges_worth_it.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412380/normal_6029522d86334.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/befaxirupit.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/surijutox.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/what_is_included_in_an_executive_summary_of_a_business_plan.pdfIn PDF document text
    • http://lobulezinovux.medianewsonline.com/wheat_belly_recipes.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/fibexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_602ea89cd21ce.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/52478915681.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/comidas_y_bebidas_en_ingles_para_nios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447085/normal_602d65859878a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rewezaxow.epizy.com/swing_trading_tutorial_free.pdfIn PDF document text
    • http://kepagewav.atwebpages.com/lirik_lagu_one_call_away_artinya.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/normal_arterial_line_waveforms.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/96752678248.pdfIn PDF document text
    • http://jonegukum.epizy.com/punolelujabuzazimerifuw.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/pablo_neruda_poetry_themes.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_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 5472 bytes
SHA-256: 3717a048ba6f4d6a983fd82bd36f58d5d9815c56ca41408b71bbeaadbce48e57
font_01_sfnt_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 10564 bytes
SHA-256: 155e6afaa6fdeb8abe5242cb81e26dfe01cbe490c3afce35daf56704701b0d54

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