Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5194d26c83b53e…

MALICIOUS

PDF

74.0 KB Created: 2021-05-11 11:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a54e260865f41aa489e0b4ccf92905f4 SHA-1: 92ca33c27ac2d2c695e53420f7a6246fe64a5e63 SHA-256: 5f5194d26c83b53e83ff9fa74d1724f7b8498d09fc25b9ad1c4a60e9d50db737
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, indicating it functions as a link farm. The presence of a ML classifier flagging it as malicious and ClamAV detecting it as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The primary URL, 'https://baarspo.ru/strik?utm_term=unearthed+arcana+artificer+5e+pdf', is likely part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=unearthed+arcana+artificer+5e+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422914/normal_60477799abd14.pdfIn PDF document text
    • http://vasizazesunof.medianewsonline.com/pibatevatipakazetexofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_601954b0569fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_60151e4d5b408.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/nogizip_surirafaxam_petufolejik_rabix.pdfIn PDF document text
    • https://guvidojovutubev.weebly.com/uploads/1/3/4/6/134697602/0c7eb324a89b9.pdfIn PDF document text
    • https://fiwirilo.weebly.com/uploads/1/3/4/0/134096979/8474084.pdfIn PDF document text
    • http://kizisuruz.22web.org/wunosenabavugemalivu.pdfIn PDF document text
    • https://dutilugamon.weebly.com/uploads/1/3/5/3/135301630/5144569f2ed48b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368222/normal_6006ec4dafafd.pdfIn PDF document text
    • http://mujubow.getenjoyment.net/obc_application_form_telangana.pdfIn PDF document text
    • http://buyfastedcircle.xyz/xazoridusiv2bi5.pdfIn PDF document text
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/5438426.pdfIn PDF document text
    • http://ubsvp.com/agilmente_bajartt44s.pdfIn PDF document text
    • http://changepass.online/99586896357jgtqm.pdfIn PDF document text
    • https://morimisinasezub.weebly.com/uploads/1/3/1/8/131856414/vogosunivuguv-mawinezuwamakax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fivamoxopel.epizy.com/how_to_use_teams_to_track_projects.pdfIn PDF document text
    • http://vimonaker.epizy.com/39228691682.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/zodukagevonuxonavi.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_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 5148 bytes
SHA-256: 4b4a8e015dc6db7f4f2588e382baac0acb51f4970a8897526f6085c8db46ad48
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 10420 bytes
SHA-256: 3450c852403bc9729c98ce48e6e479894d45cec0cd30c8eaf54e79614b23749b

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