Malicious PDF — malware analysis report

Static analysis result for SHA-256 c965f1e0a9846ccd…

MALICIOUS

PDF

72.3 KB Created: 2021-02-21 10:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c427bd8412f1edde01057d4a55895914 SHA-1: 51cfb043714245f0a0b708b17babca11c6b1949b SHA-256: c965f1e0a9846ccd95952f88d0f06999f5d395f7fcc699b4dd1bd03601ea5620
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

Heuristics 4

  • 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://crophysi.ru/123?utm_term=how+to+pair+jawbone+with+iphone+10 PDF link annotation
    • http://philonio.online/48502237780h9d31.pdfIn PDF document text
    • http://e-devletodeme.net/horizon_flight_simulator_2019_mod_apkticqz.pdfIn PDF document text
    • http://sirovikokaxi.22web.org/dslr_controller_apk_for_nikon.pdfIn PDF document text
    • https://radutarogo.weebly.com/uploads/1/3/4/3/134379411/074687f3769.pdfIn PDF document text
    • http://xtreme-sport.ru/7_wonders_of_the_world_20184e8ag.pdfIn PDF document text
    • http://znalomstvavip.site/sejuzi4aux0.pdfIn PDF document text
    • http://in-step.shop/diaper_genie_refill_hack6ytsx.pdfIn PDF document text
    • http://pijitirade.iblogger.org/can_android_iphone_apps.pdfIn PDF document text
    • http://zajawezexefijuk.22web.org/zanapawitunaleruxefilem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidunutisa.epizy.com/37816599231.pdfIn PDF document text
    • http://wozunitififut.epizy.com/cookie_sheet_cake_icing.pdfIn PDF document text
    • http://fejukuvazov.rf.gd/9023309395.pdfIn PDF document text
    • http://fomabobas.epizy.com/95910767422.pdfIn PDF document text
    • http://jidibavozajo.epizy.com/houghton_mifflin_harcourt_geometry_answers.pdfIn PDF document text
    • http://xikabekopugat.rf.gd/software_system_development_life_cycle.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/84818569988.pdfIn PDF document text
    • http://mujasanowagug.epizy.com/37306069294.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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 5160 bytes
SHA-256: a5183ee55a5472d306816fc226294eee17df2d602b1bb872b62179c27931e3eb
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 11072 bytes
SHA-256: d67691ffc55e49b87fed5bfe7370fee1f2aded9e2d6463aad76cda5827f23ebe