Malicious PDF — malware analysis report

Static analysis result for SHA-256 f110a0fc47617134…

MALICIOUS

PDF

74.2 KB Created: 2021-03-01 21:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 17c22c372b6e12371ae677c5ab2df52d SHA-1: 88e461c202bd15c8099600309cd61c715b9fb6b3 SHA-256: f110a0fc4761713440f18645f2b70860e60ab7938cf3075c61282dabeb080257
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, which is likely used for phishing or to serve a secondary payload. The document body, though heavily obfuscated, suggests a lure related to an online guitar course.

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://druttle.ru/strik?utm_term=curso+luthier+guitarra+el%25C3%25A9ctrica+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420604/normal_5fd81f937ea5c.pdfIn PDF document text
    • http://taranif.22web.org/acronis_true_image_full_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/jc9h9Ti/elm327_obd2_bluetooth_adapter_ebay.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/nododowoxakozasilumus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/synonym_for_occupational_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/chainsmokers_something_just_like_this_video.pdfIn PDF document text
    • http://vuwoxakex.epizy.com/office_of_inspector_general_detention_center_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/phase_4_phonics_worksheets_sparklebox.pdfIn PDF document text
    • http://gagivipupine.epizy.com/48462205058.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/how_much_does_motorcycle_service_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/67569559105.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/44306210955.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/surprised_face_pumpkin_template.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/13960007068.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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 5108 bytes
SHA-256: cf1f5fd06cf0ef723ce3378edfd62a041526166d41fa849407e99492e6e5bb2a
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 12852 bytes
SHA-256: 1841a1ad74ddf7ac960c77b5f9954fd9bf69bc2296b2da4e06a64b1e9c626334

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