Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a56ac7245129ffd…

MALICIOUS

PDF

88.1 KB Created: 2021-02-25 02:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 570ffea241fc9cfd181ec1d327de2f44 SHA-1: b9d9024822d0129e5aa9f0c2f48320ba5d026a55 SHA-256: 0a56ac7245129ffda779b2bf60ba571e456f7801b6a66f52e79042855edb45b9
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. One URL, https://jottigo.ru/strik?utm_term=beats+solo+1+bluetooth+adapter, is particularly suspicious and likely serves as a redirector for malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=beats+solo+1+bluetooth+adapter PDF link annotation
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/5457153.pdfIn PDF document text
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/kiligovakowesaxarofa.pdfIn PDF document text
    • http://brandframeb.com/orquideas_de_costa_ricaq0ep3.pdfIn PDF document text
    • http://hook-up.fun/6569470459h00oa.pdfIn PDF document text
    • http://bigpleasure.ru/fozejesupizijem8zdke.pdfIn PDF document text
    • http://nonretloli.site/acrobat_pro_dc_subscriptionf4lex.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/jhheZjg/digitech_jamman_stereo_looper_power_supply.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/relion_confirm_meter_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/agBgjic/modded_xbox_one_controller_for_fortnite_aimbot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizoleline.epizy.com/kakomidizefaviwowova.pdfIn PDF document text
    • http://dojovosis.rf.gd/2016_nissan_sentra_check_engine_light_reset.pdfIn PDF document text
    • http://bejopirobi.epizy.com/84570987600.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_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 5288 bytes
SHA-256: 1d69320ec4714116483b3b74c37dc19067b1aff085be4f874ff253fecadb9b81
font_01_sfnt_off00012b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2E 12444 bytes
SHA-256: 509ff9821878d349d8fb3f515c3159c1fd21e379aed4d8337869c544e50bc140

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