Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c29a1c0e8a0cfd…

MALICIOUS

PDF

75.9 KB Created: 2021-04-13 01:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e91a39cc37084b40d3a6f9fac1ecf9c0 SHA-1: 9f1ec3ec1567ce54864aa98afe2a2dd46e1e99a5 SHA-256: 21c29a1c0e8a0cfd2c3de5cb737691fd4a3cab18f75f30e0d846c3f135e8bffa
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-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://maypoin.ru/strik?utm_term=how+to+turn+on+soundlogic+xt+bluetooth+speaker PDF link annotation
    • http://lifelalulenomip.mygamesonline.org/intel_xeon_processor_list.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/amasr_act_1958.pdfIn PDF document text
    • http://sojosabomoki.22web.org/how_to_change_the_battery_in_a_garmin_watch.pdfIn PDF document text
    • http://wotevolodux.iblogger.org/in_another_country_ernest_hemingway_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475571/normal_5fd9cca092264.pdfIn PDF document text
    • http://3bureaureport.info/32627653292ojwt4.pdfIn PDF document text
    • http://watenaz.iblogger.org/cambridge_english_empower_b1_pre_intermediate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_6066b9e59e42c.pdfIn PDF document text
    • http://alcexpress3.xyz/amazon_prime_music_90_day_trialxxycp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xeziredo.epizy.com/xumun.pdfIn PDF document text
    • http://zufarelizija.epizy.com/casio_watches_f_91w_manual.pdfIn PDF document text
    • http://guvamimifufirar.rf.gd/tricky_riddles_with_answers.pdfIn PDF document text
    • http://jegelafaxorew.rf.gd/graphs_and_charts_templates_free.pdfIn PDF document text
    • http://tagowavez.epizy.com/book_of_azathoth_tarot.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_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 5660 bytes
SHA-256: d83719e41d3e270039f63a7f84976bb08a43c801ebd3118754079e80c069a33e
font_01_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 11036 bytes
SHA-256: e331eaa7b90e685249eba76d7f02e333b3b59ff7e8cc7ecba13cd036c609a401