Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f385a94223df1e2…

MALICIOUS

PDF

102.6 KB Created: 2021-03-24 08:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e319ae4566a2eca2ea36fbdb23712099 SHA-1: 25e082c5faedc9a9566f8834536e1b754bcbfe0e SHA-256: 6f385a94223df1e2ecaaa8f59ac7600d51545981bfeab46b94b2680c31ec8b36
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 phishing or trojan payload. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'bariatric surgery definition pdf'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://druttle.ru/award?keyword=bariatric+surgery+definition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389797/normal_5ff8621cb2021.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/business_studies_grade_11_textbook.pdfIn PDF document text
    • https://batopida.weebly.com/uploads/1/3/4/6/134689087/fe3cfbe6677.pdfIn PDF document text
    • https://zutiwijutorezaz.weebly.com/uploads/1/3/4/3/134354078/c33f73b979c36.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/1210735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_60386cd0a07d5.pdfIn PDF document text
    • https://xebuvimujutil.weebly.com/uploads/1/3/6/0/136050287/xebiwowidex_rokizikigade_muvefalugas.pdfIn PDF document text
    • https://retibome.weebly.com/uploads/1/3/4/6/134680472/migozubudofa_megajor.pdfIn PDF document text
    • https://jirewolekaza.weebly.com/uploads/1/3/4/3/134387643/a07b88a6bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414156/normal_5fcdd3088c2b7.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/jxljhhh/fanesemoribigaxuwurelo.pdfIn PDF document text
    • https://mabosuvix.weebly.com/uploads/1/3/4/8/134851695/kolirofapenit.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/i2ozcRC/android_studio_requirements_processor.pdfIn PDF document text
    • https://refaxoke.weebly.com/uploads/1/3/4/6/134602084/171259.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/7aIwxm5/my_rental_girlfriend_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/TN1idja/woxepofipanosid.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/1ghiasT/arcade_bros_game_and_watch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485005/normal_5ff24e7b217c2.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/para_quem_no_sabe_onde_vai_qualquer_caminho_serve.pdfIn PDF document text
    • https://fibepuranes.weebly.com/uploads/1/3/4/0/134041348/b5c4b6cdaad38.pdfIn PDF document text
    • http://fusekimutoxi.sportsontheweb.net/92805511452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485299/normal_6015416dcee39.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f5437b-c27c-47b2-a1af-12441e7be556/excel_spreadsheet_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c19510f-607d-434e-90bf-dcab71313c33/sokekomasezefifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478237bc-7ff2-468a-aa66-3d0adafdd6dd/tuvozosaxoture.pdfIn PDF document text
    • http://farovosodiwes.atwebpages.com/traados_de_caldeiraria.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_off000151de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DE 5440 bytes
SHA-256: e681030a0230d00902ac31da0402d07a4df022803af46272e656d35c6b23f1d4
font_01_sfnt_off0001647d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647D 12228 bytes
SHA-256: dace279487d5190be717070fb0cb351a1fcfddf3470e7988116e8296e7312800