Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9307f6c6944af5…

MALICIOUS

PDF

73.2 KB Created: 2021-06-10 00:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d9ce7f7dbac8d24ef894ecc3b8343dc2 SHA-1: e9419c1b6e9908ce96a6a4a0d44e92246155d503 SHA-256: 4b9307f6c6944af5e1a13ff6bf56031d47cd26a9d64ce95c5433deb560e23093
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and 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 0.9993

Heuristics 5

  • 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 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://medvor.ru/pbw?utm_term=female+god+of+mischief PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457318/normal_6015e31bde638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410714/normal_604464d51e1f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471703/normal_6023e278d0167.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4501777/normal_60b00687929f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5fd5f9f2c7d6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5ff6c2b981437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_604fcaf957adf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_6032e7530fe9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473388/normal_604472d8a7a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444647/normal_60224a9deb552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_602c329ad5c4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nadupodifado.pbworks.com/w/file/fetch/144448746/futuvatokogafujolewevif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88063c5-4969-4aae-b77c-aae795391358/suwekajabufusazupakorola.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144458595/pop_quiz_word_template.pdfIn PDF document text
    • http://xemademeku.pbworks.com/w/file/fetch/144692829/julius_caesar_play_translation.pdfIn PDF document text
    • http://jotoxipigi.pbworks.com/w/file/fetch/144584154/tipos_de_poblacion_en_metodologia_dela_investigacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73784479-c6ef-456c-96b2-10cda36a42cd/what_does_the_word_palsy_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00bd8371-0415-4f1e-9843-acc22bf6cdab/48696114966.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/palabras_esdrujulas_sin_tilde_ejemplos_100.pdfIn PDF document text
    • http://mitamugukojo.pbworks.com/f/35862107361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110439e6-b77e-43d1-b5ac-39855108a3bf/m_love_h_letter_whatsapp_status_video_download.pdfIn PDF document text
    • http://sapagujedok.pbworks.com/f/zapevevejasulutipol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8f8cc9e-eced-4cac-804b-0551feaf5917/meraga.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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 5292 bytes
SHA-256: b1f171b4a1785c4a2135e03534563ca01684d419351374920c44a8317890b2c9
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 12692 bytes
SHA-256: 5bfb4bacc114bbbd863e158207d6f8b53d33293b13c013a295dbfc7abe799264

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