Malicious PDF — malware analysis report

Static analysis result for SHA-256 75832f7ffc1d960a…

MALICIOUS

PDF

78.6 KB Created: 2021-03-28 09:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c741b9b2fceee5c9a705485eeb4799ff SHA-1: 48c8dd7ab13002b6e0ed63ae64c35b6d75a4c522 SHA-256: 75832f7ffc1d960a8dcc25db05989663cdb6189cb25e9a94dc692b830be0b854
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=ralph+waldo+emerson+quotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5fc6911f2de56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_60364d03c39e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_602be8fcf1957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fd62aa30506f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459805/normal_5fecb77a1d672.pdfIn PDF document text
    • http://clientbluebadge.com/manual_de_epidemiologa_y_salud_pblica_hernandez_aguadox8v87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_601ddcca6ecf2.pdfIn PDF document text
    • http://bowuvudofi.scienceontheweb.net/veronica_roth_four.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_602ef1e18852a.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/best_python_learning_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5ff1d29f622c6.pdfIn PDF document text
    • http://salonly.xyz/ab_word_family_worksheetsytaxy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383475/normal_5ffdb1fa80d56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5ff75f2e5c320.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gupatevefojip.myartsonline.com/manual_de_primeros_auxilios_cruz_roja_colombiana.pdfIn PDF document text
    • https://0bf12466-9c44-4b11-a9a5-fac9ce0d1baa.filesusr.com/ugd/f34823_852af97ee99a4e4eb0a1aea049737cb0.pdf?index=trueIn PDF document text
    • http://xekazaz.myartsonline.com/word_problems_on_addition_and_subtraction_for_grade_5.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_eb7b8678f0094e4c9a7b998e9b5d67af.pdf?index=trueIn PDF document text
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_cecd34659b154efebe66ae689af3b9ec.pdf?index=trueIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_a133f8fdce044d72b76830c53838e7cd.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_e229b932b37849a88b946fefeabed71a.pdf?index=trueIn 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_off0000f755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF755 5424 bytes
SHA-256: ed86639c02c7dd9bfd7e4605b4290bb6b38892e92dbc1210be2c686c7415280e
font_01_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 10496 bytes
SHA-256: b8761e0f3da84210183a8d36cb17ea4f24260bfcf6bf0b03bf959b1a2b79ebb6

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