Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a247a37a3fd719b…

MALICIOUS

PDF

74.6 KB Created: 2021-03-11 14:27:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01c63eeaf5fe9ad580661a8eec1d2c52 SHA-1: 87f2d196794e33a1c6f2e1a801142c9d51c01187 SHA-256: 1a247a37a3fd719b3572c8fd5a370acb5a0f34eba688eef3c474b54431ae7e07
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, likely to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/award?keyword=berossus+and+genesis+manetho+and+exodus+pdf PDF link annotation
    • https://cdn.sqhk.co/bodujemep/jh7hfge/my_t_mobile_online_login.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/jbhaJgc/45623818600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405687/normal_5fffe340d5425.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496360/normal_5fc969beb7954.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5ffdcc9219380.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/what_can_make_your_blood_pressure_high_during_pregnancy.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/dekizif.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/dJz3WmU/masevo.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/zerofipovepigotupoxideged.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/92053165318.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/hossana_marcos_barrientos_letra_acordes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488139/normal_5fe116fdc0bb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc698a10-9340-405d-922d-3bb867988bde/woxurenejenalemiwofix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615ab2c7-1985-45a2-a388-541d3247b92b/see_me_nicholas_sparks_movie.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/thomas_merton_prayer_of_surrender.pdfIn PDF document text
    • http://jifimurosesapu.atwebpages.com/topixipobij.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/97269537760.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_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 5540 bytes
SHA-256: e44180ae6dc9184a02ee4177025832baad2dedc783da595a0b45fcc6bcc9eca6
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 10004 bytes
SHA-256: cfd4507b5ad3fa018d7e5bbaf0edf5ca378f5162dea3ae536c44e9be018fdcb7

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