Malicious PDF — malware analysis report

Static analysis result for SHA-256 390e29fd55dcca38…

MALICIOUS

PDF

76.6 KB Created: 2021-03-14 13:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1ff56686dda78ec26fa9e66124235923 SHA-1: d142a13415af7dd41b689e20661f55e34b76fc26 SHA-256: 390e29fd55dcca388de3a7dda963244bf147d6b6a42dd20f6a079db2aa828e72
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly indicates maliciousness. The presence of external URIs suggests an attempt to redirect the user to potentially harmful content, possibly for phishing or malware delivery.

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://ponafet.ru/wix?keyword=secure+property+management+clarksville PDF link annotation
    • http://itayoga.space/upsc_civil_services_exam_syllabus7tpw5.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/jgiiZxo/89492838931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_60047e90235eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_60016599144d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_6018a0d8a4640.pdfIn PDF document text
    • http://epaytds.xyz/brother_sewing_machine_vx_1120_manuala7wso.pdfIn PDF document text
    • http://jushq.club/tipumoseweguwalajijewu76rr6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_5fd38c4e1fdf6.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/jHQPNid/75426457283.pdfIn PDF document text
    • http://wosidigelime.iblogger.org/xabozerijanoganalesofijez.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/akjjidM/96505402118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391305/normal_60240e13c118f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419451/normal_6038089de1e28.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/81a034fb-3ab0-4646-91b1-450c2ab5f55c/gagov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/945b3f30-5a83-4955-8782-e4130f2ed2ba/models_by_mark_manson_book_summary.pdfIn PDF document text
    • http://bunopudo.rf.gd/charlie_chaplin_2_songs_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0825acc2-b832-42ca-8fb6-4a5123fe9c94/hardest_harry_potter_quiz_youll_ever_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38facf64-0998-41e3-a446-9cd0b13d5c66/16862755097.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_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 5580 bytes
SHA-256: 024e6065816a27c6ffbccd761626be5fdb5f19430e2d8c7bf200431d2d280fba
font_01_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 10980 bytes
SHA-256: 8d4c0bac91e37fc7c03264ad67a5550de457abaf70bc8db39fb2551835d17886

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