Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a60a5fef00233fd…

MALICIOUS

PDF

72.7 KB Created: 2021-04-08 12:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d220ddaece91dc7e07ccae81d844a66b SHA-1: 877fcce9db448601e08da11649963bf5d4b58b4f SHA-256: 6a60a5fef00233fd6783f839d0e59c5bb8ebb1fd3955c0564ffb15a535aff62d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable domains, often used to distribute malware or for SEO manipulation. The primary URL, 'https://mezovuduw.ru/strik?utm_term=alfred%2527s+essentials+of+music+theory+book+1+answer+key', suggests a lure related to educational materials, likely to redirect users to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=alfred%2527s+essentials+of+music+theory+book+1+answer+key PDF link annotation
    • http://digosige.mywebcommunity.org/65822813438.pdfIn PDF document text
    • http://rokuboxajiga.medianewsonline.com/job_interview_questions_and_answers_for_fresh_graduates.pdfIn PDF document text
    • http://gaximivotekole.mypressonline.com/icse_class_10_biology_book_download.pdfIn PDF document text
    • http://fozakewugumomig.22web.org/poder_amplificador_de_audio_profesional.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418199/normal_605be6ac7d90c.pdfIn PDF document text
    • https://metenesepagozo.weebly.com/uploads/1/3/4/7/134710396/3458257.pdfIn PDF document text
    • http://kawasus.scienceontheweb.net/ruger_lcp_380_custom_review.pdfIn PDF document text
    • https://wofovadorobonam.weebly.com/uploads/1/3/0/7/130739883/a5a103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_60377516a991b.pdfIn PDF document text
    • http://nitesufi.sportsontheweb.net/55245938345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5fe8217781063.pdfIn PDF document text
    • http://viruxego.mygamesonline.org/73685759778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nosijatigatu.epizy.com/bootstrap_form_validation_w3schools.pdfIn PDF document text
    • http://jusibutotesax.epizy.com/nusodewopubibatuloridu.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/36701805264.pdfIn PDF document text
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_e6e5e5b2d709498f8958f78a4e3938a7.pdf?index=trueIn PDF document text
    • http://vedixemalirugi.atwebpages.com/candombe_de_mucho_palo_partitura.pdfIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_87ec2bede9b74ab7b6bd2b614fde89ba.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 5616 bytes
SHA-256: 30e894ca3ff224b62b8436f542f11fc98537622fa08c91f76095e8f4b5df931e
font_01_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 10648 bytes
SHA-256: 54cf18f8fbc1b0e4dc6bf9a9a1ccfd2d805a0450522a8ed0991d3488c6793576
font_02_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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