Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0fdf16adaa33a8…

MALICIOUS

PDF

76.1 KB Created: 2021-02-24 08:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: afc24c98ca4a79a12962e2d833b3a653 SHA-1: 76a7ca42c375e05429b68ac57b2be16ca2ee459b SHA-256: 9e0fdf16adaa33a89ac4890d3afb5d67ab088a0f1b55f1dde491d436dd319fc7
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/wb?keyword=la%20odisea%20resumen%20canto%2011 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483082/normal_6022ff2a81e68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_6019666633683.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_6021d02f1d6d4.pdfIn PDF document text
    • http://kanurapubefuxo.iblogger.org/15742029104.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/d8f4e248f32f7e6.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/jyyzhhs/ballet_classes_for_adults.pdfIn PDF document text
    • https://cdn.sqhk.co/vefomatakin/jcse83u/castle_wars_online.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/Pphcbjc/97725421818.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/judejuxenow-zikusijejigep-lenane-zabatomazamalid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5fd7a8ef0522d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413119/normal_5fe44a585de7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lidesesepaz.rf.gd/jamaican_passport_application_form_2019.pdfIn PDF document text
    • http://lugaderova.epizy.com/free_background_check_forms_for_churches.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/azur_lane_formidable.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/r_ggplot2_cheat_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2F 4928 bytes
SHA-256: 4bc0a84d2a331eb9b2ba3dc4638432f19b3208ca7c33afa62e27de70a3bccde6
font_01_sfnt_off0000eed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 11320 bytes
SHA-256: 13cb712c98ac310a838fe176ed7cdc79998c1d56cf6476f11ad3a7780c9cf060
font_02_sfnt_off000113ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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