Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4a52a11a607463…

MALICIOUS

PDF

75.6 KB Created: 2021-03-28 19:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6cf22a076715296a37d61d0d3b73a8c9 SHA-1: 37959193bafced8c328a9c7572e15069c3b68c05 SHA-256: ec4a52a11a607463d2cd816424c1bfae90a4cb327293a56f0bb816294fe1a413
126 Risk Score

Malware Insights

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

The PDF file contains a link to 'ponafet.ru' which is presented as a download for Spotify Premium, a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/wix?keyword=spotify+premium+apk+free+download+offline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369324/normal_603300f3e7e20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_602640574fe91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_6045022aa6dcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_6003bf8aa88d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_8fea9ebba8e14705ae5a379d6ae0e41d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd25a16-5846-4530-91e2-d62ce0367324/kenmore_elite_side_by_side_refrigerator_repair_manual.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_d28c06592fe748b9baaf76c42f77e6b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c6f102-f9bf-4a46-8876-62e459e1c837/gotedolezonena.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_faf8c210281e446ea1dbf310dea600d0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64cab29-3dcb-4f99-8ba9-79dd3e5caf08/52039674112.pdfIn PDF document text
    • http://wubonaxe.epizy.com/bbq_invite_template_word_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f8fc3f-da42-4e68-a13b-f3a0189e473e/cuisinart_fondue_pot_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07aec3fc-e057-438e-9d66-eadbcf7c52ed/magobinusonatojupeped.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_ef1a44f5e59e44509c005c5f7b3d3b41.pdf?index=trueIn PDF document text
    • http://fopuzotetowux.rf.gd/forme_di_campanilismo.pdfIn PDF document text
    • http://besuwodusibix.rf.gd/absorption_spectrum_of_chlorophyll.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_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 5372 bytes
SHA-256: 5b2cce7eb102e08bb2e73fdab3f3eeabdb4ccb6a454510c05112ef26b429e242
font_01_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 11076 bytes
SHA-256: 750339bda8b7917473f15b8eeca673a1090001faa77fc67f716659cbe45281ee

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