Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21402567eeed968…

MALICIOUS

PDF

76.1 KB Created: 2021-03-31 10:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f1af0a7931f096e19cba95c8006599 SHA-1: 65a944bd18ba121d9cd09da62d353501be2a8139 SHA-256: c21402567eeed968f84675178e843f6dfe6f591dc9e07e03f9357dc116e72fd1
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs that point to domains associated with link farms and potentially unwanted software downloads, specifically advertising an "ios keyboard apk free download". The document body, though heavily obfuscated, contains references to the authoring application and creation date, but the primary malicious indicators are the external URIs and the overall classification.

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://pelibifir.ru/wix?keyword=ios+keyboard+apk+free+download
    • http://abwaab.su/189698104964svmv.pdf
    • https://static.s123-cdn-static.com/uploads/4407733/normal_6003386dc15bb.pdf
    • http://pannochki-art.com/free_text_message_stickers_for_android9bgnv.pdf
    • http://zakewabo.scienceontheweb.net/how_does_the_gone_girl_book_end.pdf
    • http://resimpub.com/optiplex_790_sff_cpu_upgradekqp39.pdf
    • https://static.s123-cdn-static.com/uploads/4403283/normal_5ff9c1a49b9c2.pdf
    • http://it50disconto.pro/70999003501vs4wa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/70fbf034-3e10-4bd6-99fd-5b145ecbac44/place_value_expanded_form_worksheets_1st_grade.pdf
    • http://pekomuvave.myartsonline.com/25269312152.pdf
    • http://nakixaxev.myartsonline.com/antony_and_cleopatra_analysis.pdf
    • https://uploads.strikinglycdn.com/files/143930f8-88ed-4e1e-a0e4-3085bf28eac5/database_management_salary_2019.pdf
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_78a33511217c4c38ab2ddf7f2fc94732.pdf?index=true
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_53420966fec94f4cb980f4cb873ba139.pdf?index=true
    • http://bigamutalunu.atwebpages.com/jonomonapoponu.pdf
    • https://s3.amazonaws.com/nowonovege/97823732614.pdf
    • https://s3.amazonaws.com/kubafezin/guvavulo.pdf
    • https://s3.amazonaws.com/belopudevuzuza/windows_10_pro_for_pc.pdf
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_455878fabe9b498f92d8ecab7dadc3d9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec90.bin
0d59cf62c06cb16c9068087bc52da25d124f937d9dde3b76e8d2fba2f7add602		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 5368 bytes
font_01_sfnt_off0000fefa.bin
d834dd1d55076939b9da053be207a8685196b0c1b9f339ff98f7c6591d39752c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFA 10760 bytes

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