Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03f6ea1789fc115…

MALICIOUS

PDF

78.4 KB Created: 2021-02-26 14:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 943c0dfe69c9151fd915b809c4b36f74 SHA-1: c92efe034448282d61931f039abe20bd311560ac SHA-256: b03f6ea1789fc115c5ccea7f388f6260b0c3fba242111a3116b0f7e49039b0e4
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 domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or scamming activities. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=what+do+physicists+think+of+big+bang+theory+show PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474989/normal_6009db3719cb6.pdfIn PDF document text
    • http://kutalevewomem.22web.org/amparo_indirecto_en_materia_fiscal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_600f57b4a8455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_601448545370f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd1b4e14588e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451205/normal_601cb7bd2cc6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_600ddb4ac6675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_60121e6e7d8b3.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/ahgijfz/titan_quest_review_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_6025353474bb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483864/normal_5feb9aaa2ba58.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/MAlhceq/zovelimune.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/WJVNOig/supamev.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/kGjfcyc/studio_108_yoga_schedule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://surotipetufamam.rf.gd/how_to_draw_circle_diagram_of_induction_motor_in_matlab.pdfIn PDF document text
    • http://nepogewapiw.epizy.com/10114324454.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/how_to_use_an_electric_voltage_meter.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/midedumuxevulasitavepuvi.pdfIn PDF document text
    • http://xudonujedetatik.epizy.com/9324355573.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/cross_filter_report_salesforce.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 5584 bytes
SHA-256: 98ec7320de74a3f5c2f2018e722e811a4d4cb05a45ad0022eae66d299d61313a
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 10764 bytes
SHA-256: 612d612ca0403c61bb47db0d1c93501789a590b798082111247105cf453e477e
font_02_sfnt_off00011d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D90 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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