Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4979283cdd159fd…

MALICIOUS

PDF

76.1 KB Created: 2021-03-16 21:03:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cafa9ac1a3a41aff33c14e3b058b71ad SHA-1: 2c511764fdfba1bac808caa37d3f484391303e3d SHA-256: f4979283cdd159fdf55e5f230644e80f61b6d036e250d80fcb7c95cc1d7d034a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://golowaki.ru/strik?utm_term=ciudad+de+las+bestias+resumen+completo PDF link annotation
    • http://megaparegeduze.iblogger.org/84970935001.pdfIn PDF document text
    • http://guwizerawefoke.iblogger.org/free_whatsapp_app_for_jio_mobile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491686/normal_600e5ae8283d2.pdfIn PDF document text
    • https://cdn.sqhk.co/wasusoguba/bhie1XX/uefa_championship_league_table_2019_to_2020.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/42860459625.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/hrBgjjj/clockwork_orange_costume_ideas.pdfIn PDF document text
    • http://vurupilinimini.iblogger.org/anzus_treaty.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/13022229447.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406514/normal_5fc6a68c10a0c.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/brief_publicitario.pdfIn PDF document text
    • https://cdn.sqhk.co/zupivikeg/dhd2che/kanobufexixenav.pdfIn PDF document text
    • http://tajizomekoza.iblogger.org/39152825117.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/Aggxhbg/phantom_squad_metal_force_mod_apk.pdfIn PDF document text
    • http://jepegupunu.mygamesonline.org/carbohydrate_estimation_by_anthrone_method.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_e5b0896ea1324b95a0dc29cce08bf2a1.pdf?index=trueIn PDF document text
    • http://pigutun.myartsonline.com/polazizitozatuvumewoxovek.pdfIn PDF document text
    • http://dunupilopun.epizy.com/effective_business_communication.pdfIn PDF document text
    • http://betetedapunu.epizy.com/arduino_lcd_kit_price_in_india.pdfIn PDF document text
    • http://tebalakafepikob.rf.gd/sisisuxeguvonopufamazabe.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_2381a64f9ee04216ac9486485c8e7d25.pdf?index=trueIn 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_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 5264 bytes
SHA-256: 1a914903bbc1dc38bc4e24cb85496ba682fedc06776a5b65326ec55c8db98fd3
font_01_sfnt_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 10936 bytes
SHA-256: ecb13c99c27792e873cce1747771511c3de3bcc86d5c7e75bd68ae166949ce06

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