Malicious PDF — malware analysis report

Static analysis result for SHA-256 0779c6d326b39ee3…

MALICIOUS

PDF

83.2 KB Created: 2021-06-09 19:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d33fa1d0b48ea2d62f1fce276b0ea50a SHA-1: 5790353f25c28209f5f637cc7e28bf3d4be0178b SHA-256: 0779c6d326b39ee317dc8e630a78f0c69db4d0a77518ca63ff160f215e149f05
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/pbw?utm_term=motivation+letter+for+mba PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416140/normal_5febb67a8da52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_60bc91b43688e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_60421ad0b558d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fde439e8db66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_6058705935152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475719/normal_60321d35c3e67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_602458d0d337d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470385/normal_600ff561831a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_60b9b2488dc72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_6040bbde1bc54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471106/normal_6003db94ce8fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/144881160/ielts_academic_reading_practice_test_with_answers_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00287b96-cfd2-466c-9c70-1dd8c50fdc22/bikurilabovupenole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4508c08e-2edb-44e6-ac0a-7a785f26a60b/nenabikoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1696db-d69f-4d8a-be9c-27877081ac2c/peter_principle_book.pdfIn PDF document text
    • http://pubetejidewi.pbworks.com/f/23188229023.pdfIn PDF document text
    • http://rizukokodi.pbworks.com/w/file/fetch/144910650/82570139615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce90f828-293c-4bc3-813f-6a1362813592/patawom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55e0f96-b183-4470-96bc-d1e5b993f6c9/volume_booster_iphone_6.pdfIn PDF document text
    • http://zuwuzemoj.pbworks.com/w/file/fetch/144801234/pafarorutizaxarapid.pdfIn PDF document text
    • http://moxulolo.pbworks.com/w/file/fetch/144671619/fixed_asset_depreciation_schedule_excel_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782b8d36-f968-4653-9909-432b155987bc/duck_life_2_hacked_unblocked_no_flash.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e179cbe-5f02-46c3-baab-386287460843/best_tig_welder_for_beginner_uk.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_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 4940 bytes
SHA-256: 3d145b43b6377d6fcead55a9a5da1eb382c72c0be92ef9da8b27d57018029bfb
font_01_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 10876 bytes
SHA-256: 36e4a588ec260dc6f700c109406a5acfae3b81d0d05f96d90f0b347554868cf0