Malicious PDF — malware analysis report

Static analysis result for SHA-256 7498668f8adc0af7…

MALICIOUS

PDF

71.1 KB Created: 2021-06-09 16:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 831e34ac2345b47a916238696fa94fbc SHA-1: cfcc8a05de5a1d6ff648bdb52976082dda32050d SHA-256: 7498668f8adc0af753115f4a4c842e0a0bbe2e6c3dc9e0692028af3f97720239
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/pbw?utm_term=all+songs+of+abcd+2 PDF link annotation
    • https://wazobusa.weebly.com/uploads/1/3/4/7/134756590/478c49.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/tuzebizuloxiwi.pdfIn PDF document text
    • https://zofiludel.weebly.com/uploads/1/3/5/3/135347527/4281409.pdfIn PDF document text
    • https://leburivirabilaz.weebly.com/uploads/1/3/1/4/131453170/lujuva-powikukepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486997/normal_6018ca15c5f66.pdfIn PDF document text
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/gitupuvalaw_zoxodabunim_mupinefo_kuwiruzowame.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/4b04e0b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424040/normal_6060f8355fe18.pdfIn PDF document text
    • https://bomutakarekavag.weebly.com/uploads/1/3/5/3/135330682/banolix-bosozewisolet-fabidemolosijop-pezufusidegeril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_604af3f51b3dd.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/3ab2a6d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_6058207e310e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b82191-52e0-49eb-9f16-43ba42489984/realidades_3_workbook_answers_page_23.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144669543/cnn_news_china_india_border.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e461dfd-ffb8-4ae5-95eb-3d62fc17072d/how_to_survive_college_with_adhd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bb9613-7d1b-4fe4-9071-3f4e657a69b0/schwinn_270_recumbent_bike_resistance_repair.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144516465/24078157655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be9ba6f5-8e22-4b89-b8b4-e800f59b6b47/wutaxafewaruzubeje.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/gozojimesinasuxewefowa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e3ff0f3-0dea-4abe-bbc3-7366cce5f452/how_much_should_you_charge_for_logo_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d53a363b-6d2f-4f36-83b0-ae53caa9eaa0/canon_rebel_xs_1000d_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd213af-fc58-49e0-b05f-e6ec3bdbe406/ford_mustang_convertible_price_in_india.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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 5352 bytes
SHA-256: 6f065e5a80fa3b57ea67babae512db105b80874dd58af164fe3b6fa4f7c4d395
font_01_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 10544 bytes
SHA-256: 4cf506e1c787ee00156b71da6320b1c065f5c473e087640cdcdb9dc6c456f020