Malicious PDF — malware analysis report

Static analysis result for SHA-256 25250ade450abbe2…

MALICIOUS

PDF

72.0 KB Created: 2021-03-03 20:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 11215feeb681f06e2ea0db82537a0603 SHA-1: e5cd08778269f046a83027289b856b3f3b8374f3 SHA-256: 25250ade450abbe2793efc2eaa8e223bcba98dca357796dbd2261cd031970aef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are disguised as legitimate documents or search results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful websites.

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://midufefew.ru/strik?utm_term=james+patterson+movies+and+tv+shows PDF link annotation
    • http://moxumepavigotuf.iblogger.org/coordinate_geometry_level_2_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/giIoHnY/96182181047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501385/normal_601b8788c389b.pdfIn PDF document text
    • http://dronextactical.xyz/foosball_winner_rulestplbu.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/jHjcwig/shelter_animal_rescue_group_oak_ridge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5ff87c9c90edf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fcef4325065c.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/vudujejoz.pdfIn PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/patubawomixap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477921/normal_603e9b1942cbd.pdfIn PDF document text
    • https://fivitilanafime.weebly.com/uploads/1/3/5/3/135395402/6210073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fd185cc2cbad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426571/normal_5fe93747ecf2a.pdfIn PDF document text
    • http://aycotoro6.xyz/vinesimivawofuvo4eg43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivekanudoz.rf.gd/mehandipur_balaji_aarti_video.pdfIn PDF document text
    • http://matogojetize.rf.gd/filmorago_windows_7.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_off0000dafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFB 5308 bytes
SHA-256: d88b82e6ffa7ab062c169c66b1e6e6cc1bce426481946a72672d5af2569357aa
font_01_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 11196 bytes
SHA-256: cc43e172736553253e6aa69d8597ade1254580ab2c3db875fb47b05c470fe57c

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