Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd2dfd527492d5…

MALICIOUS

PDF

81.4 KB Created: 2021-04-04 09:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 86ecebd529472286b418c49e1a48bf94 SHA-1: 447ede1feb49cb00ac4c0f3016991631fe0e4e83 SHA-256: 19fd2dfd527492d5dbf96a0c7c17441456e8b7fb3e4dfcf6f1618335e15ba1ee
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, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=how+to+spot+treat+acne PDF link annotation
    • http://pezozolagipiv.22web.org/mosozuzoxuvozitisani.pdfIn PDF document text
    • http://vepapin.iblogger.org/99411831122.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467285/normal_5ff307efec48a.pdfIn PDF document text
    • http://boviriso.22web.org/90295148315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496013/normal_606162489fd2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_601281be4d58f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesobiw.rf.gd/accidentes_nucleares_en_el_mundo.pdfIn PDF document text
    • http://bamusob.rf.gd/video_lucu_penculikan_anak_ayam.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_a15115f5c3994273a01d2e4a1792e12f.pdf?index=trueIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_48cf90fe411e45f2be290c5737dbe4f6.pdf?index=trueIn PDF document text
    • http://dodixuvizovov.epizy.com/lumaxemizijewuzorasab.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_38ab4ce1b8984d399d55ef1de1505257.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_f0257dd5ec714bd498b88209caa418e8.pdf?index=trueIn PDF document text
    • http://fabosiregoz.rf.gd/81025063868.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_ccc20725a4724f5ab839b2fe878396e1.pdf?index=trueIn PDF document text
    • http://lupexur.epizy.com/pathogenesis_of_diabetes_mellitus_type_2.pdfIn PDF document text
    • http://gulavutimomoxu.rf.gd/merit_badge_pamphlet_personal_fitness.pdfIn PDF document text
    • http://jedigosegukigif.rf.gd/84773561945.pdfIn PDF document text
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_f95385432e424825910bb44cfa1141b2.pdf?index=trueIn PDF document text
    • http://mutomipana.rf.gd/is_texting_destroying_the_english_language.pdfIn PDF document text
    • http://faxajipemafeb.epizy.com/53283382854.pdfIn PDF document text
    • http://karababeso.rf.gd/que_medios_de_comunicacion_existen_en_internet.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_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 4948 bytes
SHA-256: efc676f56ad4a2fb2c0abc276d9cce4ee3e8c24d988461c6e3d06c75ae7ceab3
font_01_sfnt_off00011196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11196 11556 bytes
SHA-256: 81d5a9ea3918b29892620aebfd72babc3cea9d2da35e6b6ced172dd826c8806b

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