Malicious PDF — malware analysis report

Static analysis result for SHA-256 831c4993cc29ea6c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 15:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2432b80edc0dfd5893606c08cb2d517d SHA-1: 1522e5560c693e30f28477a5fcecb9d0e284fbba SHA-256: 831c4993cc29ea6c2e2d735da27d34ece9135c18a54fb16d29f0661325262016
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/strik?utm_term=how+to+cut+triangles+on+a+miter+saw PDF link annotation
    • http://zugapuvu.mywebcommunity.org/lenovo_y50-70_ram_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_5fe95823c620e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_603416cc469db.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/vodafuwimujat.pdfIn PDF document text
    • https://dakilemuvepin.weebly.com/uploads/1/3/5/9/135963620/66f314d29678.pdfIn PDF document text
    • https://fuxureriwixivo.weebly.com/uploads/1/3/0/7/130739224/8723733.pdfIn PDF document text
    • https://sefewazugep.weebly.com/uploads/1/3/5/2/135293251/8636011.pdfIn PDF document text
    • https://sowematawenuw.weebly.com/uploads/1/3/1/1/131164153/linow.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/e3363eed5cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_600c1d5e2604f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_6029895f66df2.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/que_es_un_agente_de_ventas_y_sus_funciones.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/bruce_lee_book_tao_of_jeet_kune_do.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabejanaboz.atwebpages.com/43321655587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41016800-39c8-4d24-bcbc-1b9c8798bdc5/winter_wonderland_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f174f330-5b4c-4365-8bfd-f40c822b7c9f/preface_to_lyrical_ballads_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9837002-52e0-4e7e-b49a-356790780a9a/how_to_use_the_weight_watchers_food_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7756aaf-a09f-4812-814e-7060c5a93a99/68724926687.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_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 5172 bytes
SHA-256: 4e8d262760669956dfb83a2e24d6416e182ea4ef9755ef73ef4c9e40e8e399cf
font_01_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 10652 bytes
SHA-256: e3835f64813c70e8f12f3d7f084143664833671773c2fd2c7c8f43abbacd23de

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