Malicious PDF — malware analysis report

Static analysis result for SHA-256 90dcf8292c0d14ad…

MALICIOUS

PDF

185.9 KB Created: 2021-04-19 05:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4fad124c7f03f079ef14466ae7da32df SHA-1: 611f5271f0b377c39f1c6f800efad1a908a36755 SHA-256: 90dcf8292c0d14ad6a15667e16c5f6b6e7af7169832e9a534aeea711dda45ed5
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of external URI indicators and link farm heuristics strongly supports the attack pattern of luring users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/strik?utm_term=dia+de+la+revolucion+mexicana+para+ni%25C3%25B1os PDF link annotation
    • https://cdn.sqhk.co/miweguzeg/ath1Nhf/slay_mama_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/bRkpJXv/fatip.pdfIn PDF document text
    • http://delayikapy.xyz/ygs_de_km_blme_blnebilme_soru5twul.pdfIn PDF document text
    • http://obmenkalnr.online/analysis_essay_samplewz6fc.pdfIn PDF document text
    • https://cdn.sqhk.co/nadetajagupe/dttAljj/rumble_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/jjijehh/service_project_ideas_for_high_school_clubs.pdfIn PDF document text
    • http://lianhua.life/xalalikz70q3.pdfIn PDF document text
    • http://itgermany.net/how_to_get_a_cashier_job_with_no_experiencepjsur.pdfIn PDF document text
    • http://umkatrade.ru/ge_8_device_backlit_universal_remote_control_codesb141c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://denakisewir.epizy.com/affidavit_template_south_africa_word_document.pdfIn PDF document text
    • http://besaware.epizy.com/what_is_the_best_workout_for_seniors.pdfIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_a464b39396834d5b880e5adb2187d133.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_2a8002cafd6c48cda5accf5935c83848.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/25487218405.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/22138652999.pdfIn PDF document text
    • http://mamuwudusaxu.epizy.com/analytical_reasoning_book_for_cat.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/sexasiwotix.pdfIn PDF document text
    • http://kunowulinivelal.epizy.com/litotujeniwinenag.pdfIn PDF document text
    • http://filazit.epizy.com/which_moment_corresponds_to_the_minimum_kinetic_energy_of_the_system_chegg.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_54d4de45ea5b4325910072acbf10d9dd.pdf?index=trueIn PDF document text
    • http://winifazal.epizy.com/antidoto_barbituricos.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/how_to_get_free_bags_on_allegiant.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_off000298d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x298D9 5556 bytes
SHA-256: 1d4028ee282b94a6f0e29daeed25cb21f73fa57f905f1c11a51ca4914f29103f
font_01_sfnt_off0002ab7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AB7A 13716 bytes
SHA-256: c8dba4f65247b2c4439ef132c995205783727dae0b31a72761d87f91d9469cd1

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