Malicious PDF — malware analysis report

Static analysis result for SHA-256 758c4fbcbc6616ed…

MALICIOUS

PDF

62.7 KB Created: 2021-02-18 07:20:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d1ebdc62d3bb75df768ed20a022c4d23 SHA-1: 188bad5f26a71bcd18d5d7c54939ad3625286dc8 SHA-256: 758c4fbcbc6616ed0fd76a5505116a941fe3b2d67300ed4773026ce2f7503b27
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings suggest it's part of a link farm designed for SEO manipulation, likely to distribute malware or phish for information. No scripts were extracted, but the overall structure and URL distribution point towards a malicious document.

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://baarspo.ru/wix?keyword=the+nature+of+science+worksheet+answers+section+1 PDF link annotation
    • http://websporizle3.com/13832910434n59rb.pdfIn PDF document text
    • http://presentinsta.online/wetutubetejefudeo150i.pdfIn PDF document text
    • https://gazulaloruvuv.weebly.com/uploads/1/3/4/6/134693071/1404583.pdfIn PDF document text
    • http://instapriz.online/film_action_full_movies_3gpy6son.pdfIn PDF document text
    • http://paksorond.xyz/89848480893ubala.pdfIn PDF document text
    • https://zatuzura.weebly.com/uploads/1/3/1/4/131453499/mumonofatobo.pdfIn PDF document text
    • http://newyearshop.site/kidugaburora8hauk.pdfIn PDF document text
    • http://show-visitor.xyz/analytical_chemistry_7th_edition_solutionsgdwmx.pdfIn PDF document text
    • https://jakoxizejibak.weebly.com/uploads/1/3/4/3/134348863/zolawuxuxoxexe_biruxuverexawe_golakezup.pdfIn PDF document text
    • https://pasetesosetoje.weebly.com/uploads/1/3/0/7/130775590/wubonipijuxase.pdfIn PDF document text
    • http://nekretnine.site/camra_good_pub_guide_2020hpzmw.pdfIn PDF document text
    • http://afterdealer.pro/crowe_horwath_reportvcnjh.pdfIn PDF document text
    • http://geesecam.com/nokudermdmwz.pdfIn PDF document text
    • http://podcard2020.site/cloud_9_vape_shop_greenville_nccrk1r.pdfIn PDF document text
    • http://rubka.space/24101269272ql15r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gukupexokopiwug.epizy.com/keninaburuvilofuna.pdfIn PDF document text
    • http://pitudug.epizy.com/steam_power_generator_mini_project_report.pdfIn PDF document text
    • http://jugikan.epizy.com/sewage_wastewater_treatment.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_off0000bac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC7 5092 bytes
SHA-256: 0ac11d2366992753ec9f6595668f2679a75fae118f91d685dbf4589e14322be2
font_01_sfnt_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 9852 bytes
SHA-256: 2308f3a5919b1cb4e9429708b244d3b1d8f7fa9367801153d58bb4f88af8a11d

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