Malicious PDF — malware analysis report

Static analysis result for SHA-256 400387fdd08d8552…

MALICIOUS

PDF

81.2 KB Created: 2021-04-28 15:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7bfc280c05bf70c1ae52b9cf5c3261c7 SHA-1: 1250e282fe98efc8f803d99937548feab49ba07d SHA-256: 400387fdd08d855285460d1525a02a5d7cc6ad097f37207fbfe8cee2fc310875
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 0.9990

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://baarspo.ru/strik?utm_term=who+makes+rca+freezers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490364/normal_603c5535779fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486344/normal_5fcb2b0333b38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_605dc1fa66c73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_5fe9121f1f120.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447914/normal_60622ea521d5f.pdfIn PDF document text
    • http://ipoteka.net/35529531495h3yrw.pdfIn PDF document text
    • http://rentline.pro/homework_rubric_samplezu4sd.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/kunudoz.pdfIn PDF document text
    • http://wejesigozolireb.getenjoyment.net/semi_detailed_lesson_plan_in_english_grade_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6010b6287e0a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374983/normal_6008470068070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc7339e8bfec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408184/normal_5ff8af15b94bf.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/80341216663.pdfIn PDF document text
    • http://3bki.ru/sports_event_management_systemvtw6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_603a465f0d643.pdfIn PDF document text
    • http://itnegozio.info/12042551322t5xs.pdfIn PDF document text
    • http://podcard2020.site/zelofesiqbhw4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_6004781cd3d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_600aaeb908eb9.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://disoluje.myartsonline.com/is_physical_therapy_covered_by_tricare.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/1731843487.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/lelobaloderovobojilov.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/peraxezawoputanagoxoj.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/nc_drivers_license_renewal_online_requirements.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 4772 bytes
SHA-256: f1d57ed0a9a8470c1b0ed066bb1ee9f3cd9ec6894208e742ef7b4b43ea5e0251
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10424 bytes
SHA-256: 301e637120e81fabd197b0298d48dd236d1ebd041bd92fba1ead5ec34424ccc0
font_02_sfnt_off000128b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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