Malicious PDF — malware analysis report

Static analysis result for SHA-256 924a43f6cef09c14…

MALICIOUS

PDF

81.5 KB Created: 2021-02-15 05:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 806b33c230014a8dca12e7c95481d770 SHA-1: 7e790363dd5a5eb21565e575f18315a8d1371500 SHA-256: 924a43f6cef09c149f27c8754e8ba334723a2c72ea7427b73c948f6e547c432b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains malformed streams and multiple external URLs, indicating malicious intent. A critical heuristic identified a lure to execute commands via the clipboard, suggesting the document is designed to trick users into running arbitrary code. The ML classifier strongly supports a malicious verdict, and ClamAV detection confirms this. The presence of multiple URLs, some pointing to disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://baarspo.ru/123?utm_term=xcopy+vs+robocopy+command PDF link annotation
    • http://golomashvanna.xyz/xutezofiluvokaiuojx.pdfIn PDF document text
    • http://hookup154.fun/93409488383q4g.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/chcqJJa/dixilew.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/hfspcga/infamous_movie_rating.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5fc6a3c7f0230.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_600aad2bbd96f.pdfIn PDF document text
    • http://salleapp.xyz/7576788696g2f46.pdfIn PDF document text
    • http://spiritstudio.ru/fadure3lb2.pdfIn PDF document text
    • http://helplnstagram-confirm.com/pagugokufenatuspp47n.pdfIn PDF document text
    • http://ceiling48.ru/21579621483g10g.pdfIn PDF document text
    • http://eeeeeyyy.space/31646822855szt4h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498997/normal_600a763ad9966.pdfIn PDF document text
    • http://fatimuze.22web.org/converting_si_units_of_measurement_worksheets.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guwivuvasexi.epizy.com/44431307824.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/wamabigezavug.pdfIn PDF document text
    • http://mugekalamiwatek.epizy.com/honeyguide_bird_location.pdfIn PDF document text
    • http://fejukuvazov.rf.gd/dun_bradstreet_report_sample.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 9680 bytes
SHA-256: 1df9e555a53eedc439b66390b6900fb70153fa1d1e2a2d02750b9405f321191d
font_01_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 5468 bytes
SHA-256: fc646ef7df33467048ad4550e8ade09a312203a262362f567f30b921341131ce
font_02_sfnt_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 10908 bytes
SHA-256: f1a97723da141f828cdf3606f963571fd73f484ed0ea7e7f1a1ca3fdec3cb988

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