Malicious PDF — malware analysis report

Static analysis result for SHA-256 5256134e0ab635b5…

MALICIOUS

PDF

84.7 KB Created: 2021-04-28 02:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 4cc0bd942277d5bbc0fb7ec9f7f52aa4 SHA-1: a45bf063c9edd5d9a44267f643ea637cb025718a SHA-256: 5256134e0ab635b5dcc58421579f8a4b8dd85c09a019c9e8b5b494d498f25d4b
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting sites, with one prominent URL suggesting a lure for MP3 downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing attack designed to redirect users to malicious content.

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://nipisod.ru/strik?utm_term=safety+dance+glee+cast+version+mp3+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471099/normal_606c298edbb34.pdfIn PDF document text
    • http://naturalik.fun/employee_onboarding_handbook_templatey5l2g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369788/normal_5ff5c3f0599f1.pdfIn PDF document text
    • http://rokonagusedat.22web.org/fray_bartolome_de_las_casas_libros.pdfIn PDF document text
    • http://levantemosaic.com/81213883007uw07q.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/74559608040.pdfIn PDF document text
    • http://guwixamu.iblogger.org/nouveau_guide_alimentaire_du_quebec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368238/normal_5fec1f8d66148.pdfIn PDF document text
    • http://ejqy.com/6969866779pdaxl.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/64642213853.pdfIn PDF document text
    • http://all-system7.work/tekanakojarisofemej3off.pdfIn PDF document text
    • http://sizuxofutitarax.mypressonline.com/bf_skinner_behaviorism_theory.pdfIn PDF document text
    • http://wobufiparezir.medianewsonline.com/cours_d_atomistique_s1_smpc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pizenusogusu.atwebpages.com/vedixuzopudifodonopeno.pdfIn PDF document text
    • http://limidiladafa.epizy.com/88308231980.pdfIn PDF document text
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_5b9f30482a584b4a8273962bbf5efe24.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_680f711e9a464d27bf0678f818542a0a.pdf?index=trueIn PDF document text
    • http://ponowuvibux.epizy.com/aircraft_weight_and_balance_handbook.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/wilobewomerati.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_1d4886415d8946e187ad4d4537246319.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 5996 bytes
SHA-256: 985c7b88d017b2d384259518ca87e53eb07cc70f43f04fe20811be6882e52576
font_01_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 11292 bytes
SHA-256: c9aaee017a5b56b46c576b4fa2b8f8d98277caa118a65c053c024a4e6b3ff04e
font_02_sfnt_off00012cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDB 17112 bytes
SHA-256: 32e6e9f64ab709fe9cf35328b463d17dbcbe26f3fd6b72cf25a44e69ebf2fc60

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