Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f839d04968d797…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 14:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b9d3559a616c4c2ca3e092d5b3c16dc3 SHA-1: 2b32e470a995e060cc2da7716c54924ffaeab4fe SHA-256: 77f839d04968d7977022ec89b7e834aa1241b72233cf3d39a651bf9e0353958d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious content. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the 'link farm' heuristic strongly indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=are+ryobi+battery+mowers+any+good PDF link annotation
    • http://debugor.iblogger.org/fizafafulekobifugisux.pdfIn PDF document text
    • http://pemegira.22web.org/65979961801.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/beladuwexilefeko.pdfIn PDF document text
    • http://lalozakuren.66ghz.com/balance_sheet_reconciliation_tutorial_uk.pdfIn PDF document text
    • http://xusojonugi.22web.org/roretapi.pdfIn PDF document text
    • http://rifimakegezibor.22web.org/71486118884.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/dirovig.pdfIn PDF document text
    • http://fojenuf.iblogger.org/golepi.pdfIn PDF document text
    • http://mebotus.mypressonline.com/weekly_planner_with_times.pdfIn PDF document text
    • http://felofedawapu.22web.org/como_hacer_una_foto_formato_jpg.pdfIn PDF document text
    • http://miwodenexiz.iblogger.org/46240172591.pdfIn PDF document text
    • http://levupag.22web.org/boridudosupunuvikabavu.pdfIn PDF document text
    • http://gimepar.22web.org/astral_travel_for_beginners.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/amino_acid_function.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_4a51964b6ff8493f893b6adb47d1cfcc.pdf?index=trueIn PDF document text
    • http://jafafikano.epizy.com/what_is_the_white_sauce_on_spinach_pizza.pdfIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_aff6f0c5597a40ce8d67434162a66536.pdf?index=trueIn PDF document text
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_299a0d6655a54c2c86a842ca68596fbb.pdf?index=trueIn PDF document text
    • http://satelogagolibo.rf.gd/45555002738.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_ea36bb2006e247c9b4fec0aed1010cfa.pdf?index=trueIn PDF document text
    • http://ziwebizivag.epizy.com/safety_data_sheet_example_us.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_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 5436 bytes
SHA-256: b181753c25220ead238cc7dd30c905d85168ae454789328761f2f57557208b6d
font_01_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 12440 bytes
SHA-256: ea4a86593282f7137b62ea30babbd427e06992d6a729c471baee1bfcdd9bdbb2

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