Malicious PDF — malware analysis report

Static analysis result for SHA-256 92611422b5797e35…

MALICIOUS

PDF

79.7 KB Created: 2021-03-02 19:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 28112d8e25438d28872946c02ed4a41b SHA-1: f9e990ec6277fd770101e6fe3ec3ea0027f390f8 SHA-256: 92611422b5797e35798a226deb2885db975956f59a828615262be33729cc6f42
134 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_DOWNLOAD_BUTTON' further indicates a lure to encourage downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/123?utm_term=soil+mechanics+and+foundations+budhu+pdf+espa%25C3%25B1ol PDF link annotation
    • http://gilumesu.mypressonline.com/36658051418.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/tjh0ii1/59616677456.pdfIn PDF document text
    • http://confirmationhelpcenter.com/baba_ganoush_restaurant_kuchingwhvix.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/iigiIVg/dino_runner_hacked.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/vimobilubokewoki.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluxoni/Vibdt3Q/gymnastics_training_bar.pdfIn PDF document text
    • http://hookup153.site/kimimutt9jiw.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/hgibhdF/bugosodukaxajis.pdfIn PDF document text
    • http://betmoy57.com/kebevemuu0pg.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/vmGgi1o/99857171199.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/iq0iL7h/new_ringtone_2020_download_mp3_mr_jatt.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/hghdidb/67892035834.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/pride_and_prejudice_chapter_10_and_11_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/revipidamog/dlNwjda/kedopobixexuregageg.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/gi23jcl/89055502642.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/ggBjhje/28600330125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://miganuvag.myartsonline.com/67603372776.pdfIn PDF document text
    • http://kiwutixukunow.epizy.com/appointing_legal_guardian_for_child_form_uk.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5636 bytes
SHA-256: 89b5844f12c048f90828f296eb2d0157342cf9c8c6788a964a65825ca140b4a0
font_01_sfnt_off0000fb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB43 11332 bytes
SHA-256: cff7996bae5247f109c98dd448093c3ffc6131bf87b6f2165aae48fa575610a7
font_02_sfnt_off000120d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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