Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a23febc5fb48cea…

MALICIOUS

PDF

72.1 KB Created: 2020-12-22 11:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 587533e4d35389210b24f2704bceea9f SHA-1: 9ee258a654719af96022c827d352b35fa352122f SHA-256: 4a23febc5fb48ceac898b64de278ec5b375683b1751a9f554da22dfeb4f5b6d6
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links pointing to various websites, many of which are hosted on disposable domains and are associated with link farms. One critical heuristic indicates a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support the malicious nature of this PDF, classifying it as phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=labyrinth+of+refrain+lucky+number In PDF document text
    • https://wugaxaxelapuwu.weebly.com/uploads/1/3/4/5/134595152/930686.pdfIn PDF document text
    • https://figerifefiter.weebly.com/uploads/1/3/4/3/134343277/36cb1.pdfIn PDF document text
    • https://mokoluwi.weebly.com/uploads/1/3/4/5/134595511/kudupoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fb3e35e6b7dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_5fbd482800e69.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/127475.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/sabumidifafuzotunuv.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/c8816d56-bc1e-4977-8afb-0c349879622b/93362767673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddae2e88-8a12-4acc-8e87-251acde02d4d/linux_command_line_and_shell_scripting_bible_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd34ff7a-037e-4a5b-b444-4645ff7f38cf/the_sisterhood_of_the_traveling_pants_book_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d7ac403f5353fd956fc5/t/5fd1b3a8d97b572b89d8c86e/1607578537229/gunshot_wound_head_icd_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4d2508-8b93-435a-a7bd-8362843beffc/24420134921.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/rbi_grade_b_application_form_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69a121e-c83d-463f-8f13-daa07fd9a522/rigosomixenatazu.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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 5192 bytes
SHA-256: 4d34f157ccade902426ad113b9b9ed9d0cecd68432ad2743ea376171e77698c2
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 10664 bytes
SHA-256: 78ca679c78a5429c8ad56bc17c330df13f659f4adac4fe38e3e2bba1561e9948

Open this report in the interactive analyzer, or submit your own file for analysis.