Malicious PDF — malware analysis report

Static analysis result for SHA-256 e06c49122b8ad153…

MALICIOUS

PDF

70.8 KB Created: 2021-02-22 11:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 48460baf4de78eea9a5f9be6b2876ec5 SHA-1: 67cf0f76d7dabb93b4ce936d2e477c1ee37f1089 SHA-256: e06c49122b8ad153aefb04ac4278df2a7ecdeb84f97cdff40461f8cfde6b2617
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to external resources.

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://baarspo.ru/wb?keyword=data%20mining%20techniques%20for%20prediction PDF link annotation
    • http://4338bacchus.com/276957541689rtkz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fe65f0e7b2c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479226/normal_601ec09642e37.pdfIn PDF document text
    • http://thelandofbadideas.com/3046249980eyv7j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459921/normal_5fd7eb94d43d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_5fd3768c8b1fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_5fdc0ca8038a6.pdfIn PDF document text
    • http://thecabinets.xyz/python_list_remove_first_and_last_elementrp356.pdfIn PDF document text
    • http://italy50wow.pro/59484966636tbvjr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_60017b14514d4.pdfIn PDF document text
    • http://it50disconto.pro/losakimevukisebonomotawi45h2r.pdfIn PDF document text
    • http://larts.digital/vaxenofunovatuxavikumexfnr9.pdfIn PDF document text
    • http://vandify.com/making_inferences_character_traits_worksheetgus2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_5fdb8677aa79b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368760/normal_60091adfb5cb8.pdfIn PDF document text
    • http://fishland.store/lasimewitivarukosok2qde.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/jebokizez/ikea_bed_sheets_queen.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/castle_bromwich_junior_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/mixeno.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_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 5660 bytes
SHA-256: 129a0ac70d7247c37f67de81f42138916019b0d10de1e9b94559c800a9be3e30
font_01_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 10324 bytes
SHA-256: fd1cbd5699cb6e19012080d3974571581bd84e9fa3b105ae700220a3f231603c

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