Malicious PDF — malware analysis report

Static analysis result for SHA-256 458281e7c5218f69…

MALICIOUS

PDF

86.8 KB Created: 2021-02-12 07:00:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: b92bbba6bfac9d4d1a3c5a83c4c5d94d SHA-1: 1404271072e6ae21fc115d03016e202a7ba9adc6 SHA-256: 458281e7c5218f690936b87b36caf103d44ab815b1dc817682d01bd958a1b8e0
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=wow+70+80+leveling+guide PDF link annotation
    • http://xodinazafomizi.22web.org/vadelezobabosilusaj.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/PtwiiDk/86249477360.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/2957818.pdfIn PDF document text
    • https://futokodoneru.weebly.com/uploads/1/3/0/8/130814407/nibugipu-zasotarelox.pdfIn PDF document text
    • https://kobirozo.weebly.com/uploads/1/3/4/8/134846370/zenogodumeleton-zilixulepa-tapasafezov-nazimutujit.pdfIn PDF document text
    • https://donelodef.weebly.com/uploads/1/3/5/4/135401433/noxulozepakedojib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_5fe8ece939297.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/voyager_laravel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/enhanced_recovery_programme_colorectal_surgery_guidelines.pdfIn PDF document text
    • http://favukimasinete.rf.gd/a_letter_stylish_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/john_irving_owen_meany.pdfIn PDF document text
    • http://tolimimagag.epizy.com/management_accounts_balance_sheet.pdfIn PDF document text
    • http://xixitokap.rf.gd/fawepumonuk.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/77849248554.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/oracle_database_11g_installation_guide_for_aix.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_off00011790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11790 5092 bytes
SHA-256: 110026a200cc9f400f63c792dedfe90f80866ff3296f9c685bd404297fc68d34
font_01_sfnt_off0001291e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 11048 bytes
SHA-256: 23d6958bee027e83271398d2f65a7658e1db614a173da6411e12e1f7f42ae2e2