Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4526558ed0acc59…

MALICIOUS

PDF

76.1 KB Created: 2021-02-28 14:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 02600f5d2148d3809207c1482f871b34 SHA-1: 6eab8f4060f5bdb6baf0d41111a95c185d667e80 SHA-256: f4526558ed0acc59d204c7610b2de3806be4c9efb206c8883214a2c86fd1ada7
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=separation+of+powers+means+that+quizlet PDF link annotation
    • http://nuxirofa.iblogger.org/45499028782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464068/normal_5fd3247c7b13c.pdfIn PDF document text
    • http://ludunulanara.iblogger.org/brian_mcknight_6_8_12_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464330/normal_5fe23aafd4381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_60383b0bc2cea.pdfIn PDF document text
    • http://lerinumemikiw.22web.org/josuguxomopoz.pdfIn PDF document text
    • http://zefabupinakodul.22web.org/jenivobujemudenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_600a22b6951eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_602f9262db4e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428335/normal_5fcb60a76d170.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puvodiga.rf.gd/56599395300.pdfIn PDF document text
    • http://puwolir.epizy.com/template_p_l_excel.pdfIn PDF document text
    • http://vawamunasujefu.rf.gd/pedulolelilome.pdfIn PDF document text
    • http://lugirike.epizy.com/28495556053.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/monthly_expense_tracker_excel_sheet_india.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/40249888052.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/how_old_do_you_have_to_be_to_be_an_activist.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/zoziv.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/alcoholism_ppt_presentation_free.pdfIn PDF document text
    • http://widagutevutedik.epizy.com/lagu_yang_terdalam_cover_reggae_ska.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_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 5512 bytes
SHA-256: 0f12195df047409f8e61a18c2f98b7d11a1a481010ec1cdb64c769c06ada5c21
font_01_sfnt_off0000ff6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6D 10416 bytes
SHA-256: 6cb3251e6ea426f89716298cf2969971050afe0f744c026f3d354f0f1aa1b051

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