Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4023ee81d47768…

MALICIOUS

PDF

68.3 KB Created: 2021-02-27 13:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b39167e63ec8701f4bc161d8565baba6 SHA-1: 020107f1dbc4c2301811644ef69f3782709e4edb SHA-256: 8d4023ee81d47768f968fc9d37e1493292ce96186773251fc0595ceaad4cb85b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://ponafet.ru/wix?keyword=magnetism+worksheet+grade+10 PDF link annotation
    • https://cdn.sqhk.co/kewusikata/gd4hfCR/52841014296.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/01aaf447d2.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/how_much_do_george_foreman_grills_cost.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/5041862.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/moderetilefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470837/normal_601b7bf5185d4.pdfIn PDF document text
    • https://mabulibatelirip.weebly.com/uploads/1/3/4/5/134597637/migawisunatukeze.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/what_are_fixed_and_variable_costs_for_an_airline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_5fe82cf130592.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/55396784214.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/madabedababarorobun.pdfIn PDF document text
    • http://tamakar.tech/download_facebook_versi_lama_apkpure67ce3.pdfIn PDF document text
    • http://autolombardpro.ru/piremawanadunomofalisuujo7q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ce30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE30 5560 bytes
SHA-256: 177ffcf1eff08cc57284838b1b133be42666c6a5020595f1d31d9cf692e037e8
font_01_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 10560 bytes
SHA-256: 532f42eb40c977140f47a68297fb1086d9fa768187defc40ca06392f4d432c26

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