Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edaaad472c4e029…

MALICIOUS

PDF

79.4 KB Created: 2021-06-09 09:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 51a5aeb13f0159f37e1eb6f087caa1fe SHA-1: 0a79df66b7037a09e01fde7c151ea9ba7549a48b SHA-256: 7edaaad472c4e029bde24386f98771756a66b6c1a6fdbe334fa686fd07b85329
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics points towards an attempt to manipulate search engine results or redirect users to malicious sites.

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://botokaw.ru/123?utm_term=aircraft+war+games PDF link annotation
    • https://bojididiz.weebly.com/uploads/1/3/4/4/134493327/1125948.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5feb1a00a3537.pdfIn PDF document text
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/xitidalidoso-xenarejeru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446286/normal_5fcf203c23ee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_6040210343da0.pdfIn PDF document text
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/2390298.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/4018317.pdfIn PDF document text
    • https://sunuzokelegawo.weebly.com/uploads/1/3/4/4/134476032/8ee3a47609a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ff69d6802d23.pdfIn PDF document text
    • https://nugaruxiboxora.weebly.com/uploads/1/3/0/7/130738781/rodabekugow.pdfIn PDF document text
    • https://tokoposejod.weebly.com/uploads/1/3/1/3/131380771/718770.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407818/normal_5fcd1671b4509.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_60663942d2b82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wekanivu.pbworks.com/f/principles_of_genetics_7th_edition_snustad_simmons_free.pdfIn PDF document text
    • http://vejivab.pbworks.com/w/file/fetch/144780945/lakshmi_sahasranama_stotram_in_telugu_download.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/20527137262.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144449802/how_to_have_intimacy_with_the_holy_spirit.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/96770670385.pdfIn PDF document text
    • http://kukumepubop.pbworks.com/f/avery_8160_label_template_word.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_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 5252 bytes
SHA-256: bde1bf9fe340cccdb5b5e4d01f6171a124029c22341e26b420b5d8c81c24c3c1
font_01_sfnt_off000108fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 11336 bytes
SHA-256: 61be210cf9977db805b5838f2a3497f2ae2136218e792800fb30a2f543f3c9e3

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