Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b749fda8d08eba8…

MALICIOUS

PDF

77.2 KB Created: 2021-03-12 12:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f9d37facb9db85c41ffa28357dae81c9 SHA-1: 8c4e5403cbbfa1dfa2c49588193f6fff29a6eea2 SHA-256: 5b749fda8d08eba8ebb69309a2f7c1bf9c8be036a9811b10ee2fdc5fd62861da
186 Risk Score

Malware Insights

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

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 0.9996

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://botokaw.ru/wix?keyword=questions+for+battle+of+the+sexes PDF link annotation
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/9075513.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/b1536fcbe01b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376369/normal_5fdf2c019240c.pdfIn PDF document text
    • https://xefapakofaguwa.weebly.com/uploads/1/3/1/1/131164324/nasofejalozavafege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_5fda5a9e40dcb.pdfIn PDF document text
    • https://vifusixediw.weebly.com/uploads/1/3/5/3/135312005/61a216.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/5243817.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/3hf5jcB/bebugegaruxufulozutujusuj.pdfIn PDF document text
    • https://cdn.sqhk.co/xivijela/wzijifh/4042605518.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/xupolen_tatojomowuj.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/hiiggci/specialized_women_s_mountain_bike_shoes.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/1162141dd096095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_600e0715f2f53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486982/normal_5feddeb172df9.pdfIn PDF document text
    • https://rimofunoduw.weebly.com/uploads/1/3/4/5/134525219/1951e576c931a4.pdfIn PDF document text
    • https://pibubeje.weebly.com/uploads/1/3/4/3/134374065/8481968.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/8jdgfjj/69268928277.pdfIn PDF document text
    • https://wedezetepeb.weebly.com/uploads/1/3/4/5/134528952/9431040.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_87c27a3ea3ef4f9f8cabc906047f15b9.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_95d12e3eae5b4fd9b306476d05d495f0.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_a9a70e5aaa5d4d2381e19fd46f537b1a.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_1d1b56293cd844dd8c5533106f65844e.pdf?index=trueIn 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_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 5124 bytes
SHA-256: c585057e933cec45cf37747b1363476badbb8fbd4415461fbe3d900e71319645
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 10696 bytes
SHA-256: 6ecc5eb749af3ff71ab9c1d0944daf6ffc812170091bf3e869aeb60d1f3f0f21