Malicious PDF — malware analysis report

Static analysis result for SHA-256 490d5056ffe0f217…

MALICIOUS

PDF

78.3 KB Created: 2021-04-23 01:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: bf0b66025df289f017fdbfa4b2361340 SHA-1: 8867e18e180e20166ceaa39b5f9f1e8de9220355 SHA-256: 490d5056ffe0f217931f6cfebf941f7d7ef81ed16299088a8daf35d769f0fd68
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains a title related to social work registration, likely a lure to direct users to the malicious URL.

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://botokaw.ru/strik?utm_term=how+to+register+as+a+social+worker+in+the+uk PDF link annotation
    • https://cdn.sqhk.co/sawijewabob/icjeZgg/61894323010.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/kovupamogulawoj.pdfIn PDF document text
    • http://nunopasatipimav.medianewsonline.com/nabewomogomonazexitedaka.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/jj01Kge/waterful_ring_toss_phone_case.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/sarudizujoborodowoluv.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/legal_aptitude_questions_and_answers_with_explanation.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/d6igugi/68475798959.pdfIn PDF document text
    • http://jadaribod.mygamesonline.org/niwovaretutozut.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/giiHwjc/huawei_health_9_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jixuvepabu/Mijae9k/planetary_gear_calculator_xls.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_a6018b5d96c9456a9694ad99ecb6616c.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_44f781cc0b444284a4005f78c8d86c0d.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_a307f019428e4784932bfefad5d1cfed.pdf?index=trueIn PDF document text
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_63d31a06cec0496b9f1496a29f763ef5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/albion_online_android_gameplay_2019.pdfIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_db9cb1795c4c4b27a80052a5781c11d5.pdf?index=trueIn PDF document text
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_34667cfd00ac420696a0e8b4f0319d9b.pdf?index=trueIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_f9b1f1ed9ad341329be79ec8d47f6c46.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_06fc935de6ea43fc895377076af8c434.pdf?index=trueIn PDF document text
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_23337e65e8324482bcbb12e22e196d0b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/cuntos_metros_tiene_una_cuerda_de_terreno.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_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 5176 bytes
SHA-256: a304a9a31eecac2da6d5c93c2ce4ff24c73ede3c0c85c79c5ca579b7c85d53e0
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 11040 bytes
SHA-256: c21e2f9d7864d12d14f9ec3796edcbe457453c21d1ce5546fc4d721d2ac386cc

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