Malicious PDF — malware analysis report

Static analysis result for SHA-256 02121cfb9e1ac480…

MALICIOUS

PDF

73.8 KB Created: 2021-05-03 21:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cc29302185fb70b32f34ddee39e31061 SHA-1: ea0af62f7ab8722f77059a5e3ffd8e07490e4fa8 SHA-256: 02121cfb9e1ac4803389c23066da73104b13231e01de9c96785b2c306d13ded1
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, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=babybjorn+potty+chair+white%252Fgrey PDF link annotation
    • http://sipipewawezizuf.getenjoyment.net/sogedovejoxupate.pdfIn PDF document text
    • http://fortuneo-enligne.com/what_does_de_donde_eres_tu_mean_in_spanisht8p4c.pdfIn PDF document text
    • http://blacklaser.ru/79611223932jlfr4.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/dcig_storage_buyer_s_guide.pdfIn PDF document text
    • http://bred-enligne.com/fanuc_cnc_turning_programming_exampleskvkjp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416675/normal_600100dfdca6e.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/blended_learning_journal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449205/normal_5fc6cb364fc62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383149/normal_604030f40ee3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_603f3ecb21cb3.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/animales_fantsticos_y_dnde_encontrwzfvj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/online_banking_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ad2a7c-2ff9-4350-9d35-acde40dda816/mcq_questions_on_compound_interest_class_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e543f77-d08a-436f-8690-b5f95c9998e8/what_to_do_if_you_see_a_brown_bear_in_the_woods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/543181cb-e887-47b8-a361-4c74ed40edaf/romeo_and_juliet_dire_straits_chords_acoustic.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/rovafosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ec6eb2-27b4-41dc-aca2-7d2cea722d4a/92183676237.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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 5480 bytes
SHA-256: a18ea9689896b2f57f738f79c19854085a2ee7185b17fcfad5f417c13bf84f9c
font_01_sfnt_off0000f2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 11984 bytes
SHA-256: 3ec00904b3e404a5048fb9b1474b43d3fbec1f3dc229867be6704ef410abff4d

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