Malicious PDF — malware analysis report

Static analysis result for SHA-256 77064eb807bc7df2…

MALICIOUS

PDF

78.1 KB Created: 2021-05-08 05:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9dcce3c955d77b4540691b78bbfdddfa SHA-1: 166b7514dbb488a9b88f6de66ac5bce500366640 SHA-256: 77064eb807bc7df21223da9b477cf986c05b1d531452ec6a030345a6789b319a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/strik?utm_term=resumen+del+libro+rinoceronte+por+capitulos PDF link annotation
    • http://dujadesixozubi.22web.org/fuziwizabisuluga.pdfIn PDF document text
    • http://wedavinonuvovu.22web.org/white_christmas_trumpet_sheet_music.pdfIn PDF document text
    • http://timecodes.net/affinity_photo_tutorial_italianoydpj1.pdfIn PDF document text
    • http://sale50.pro/gavakf0our.pdfIn PDF document text
    • http://pirikulifiwitif.iblogger.org/18012857366.pdfIn PDF document text
    • http://sport-stavki.fun/cyberpunk_2077_ps4_updatere0a8.pdfIn PDF document text
    • http://turistik-a.ru/93366663653qssli.pdfIn PDF document text
    • http://lisolu.org/edifice_casio_chronograph_wr_100m_pricexhdrj.pdfIn PDF document text
    • http://raisinshub.club/fagezibasukasuxotito2dujp.pdfIn PDF document text
    • http://carins.info/megidasagubogepinasmpz0z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_c241fcfa76d04ada91d047ff9d17e74f.pdf?index=trueIn PDF document text
    • http://kitabud.rf.gd/tortoisehg_workbench_tutorial.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_51a74b15b76545ce8501ff49ed01e84f.pdf?index=trueIn PDF document text
    • http://bodasubosixo.rf.gd/fuxujujugipolitewa.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_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 5364 bytes
SHA-256: 3ec1c94fee6ac25134b037fe8700b67a3fdc315289092de12e4f12dfca9e47c0
font_01_sfnt_off00010204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10204 12472 bytes
SHA-256: 65b0e9cc1ee39698c18954a06b0f240302a66e3fe1db2612a57db59e3d0580aa