Malicious PDF — malware analysis report

Static analysis result for SHA-256 429fed7421e69de1…

MALICIOUS

PDF

115.1 KB Created: 2021-03-18 04:14:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2fb0e563fa2a8b31edb01c6e4049cd94 SHA-1: ceaca57e66eea3bc96c83d8d547af9cab8bfd0f4 SHA-256: 429fed7421e69de138903abd15939386bcfe4eede590471e1d1e27b46960e9c0
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 designed to redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs and the ML classifier's high confidence score point towards a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=45+second+napkin+presentation+pdf PDF link annotation
    • http://worozoxiw.sportsontheweb.net/tumidiruxatutonekimaw.pdfIn PDF document text
    • https://xedawazusaxe.weebly.com/uploads/1/3/2/3/132303108/xesadavi.pdfIn PDF document text
    • https://jadomurujamum.weebly.com/uploads/1/3/5/3/135326923/5ca1436d3f8aaf0.pdfIn PDF document text
    • https://fomodefoz.weebly.com/uploads/1/3/5/9/135958111/gowakizuxex_rurawafakus_lozos.pdfIn PDF document text
    • https://xevulesej.weebly.com/uploads/1/3/0/8/130874496/3163084.pdfIn PDF document text
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/mowaruga_tixizelimagi.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/23770846622.pdfIn PDF document text
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/fiwuwokitiluroj_zutivup.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/all_awards_and_honours_2020.pdfIn PDF document text
    • http://fajafifog.mywebcommunity.org/bihar_police_syllabus_2020_download.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/lakanusoxupawidelugisapop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sunefosopibe.rf.gd/11912021577.pdfIn PDF document text
    • http://moxixezegosa.onlinewebshop.net/giketurifiretesusosil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26fb92c-05d9-422c-b62a-6a43afe8facd/kotuwiluvetunumorutig.pdfIn PDF document text
    • http://niwakilapiso.rf.gd/how_to_connect_my_turtle_beach_600_to_my_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f89cd5-a494-4097-a0ff-ede8ed5dc1c6/c_programming_language_course_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d883d2e-abc7-4b9b-9a09-5e5c5f367b36/22971126149.pdfIn PDF document text
    • http://dezinolabebosod.atwebpages.com/39427842468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2854a39d-ceff-42ff-8f19-7af7361db8e0/9416409730.pdfIn PDF document text
    • http://kopurelotalad.onlinewebshop.net/reliability_availability_and_maintainability_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b8ccf2-8287-4c45-a2dc-67b4314ba9cc/vodonibasudefuxe.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_off0001825b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1825B 5296 bytes
SHA-256: fe45c71d3a4c61f2e7a3f4f386f18d1904e4a17292b6a375b5ead596dadf6301
font_01_sfnt_off0001947e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1947E 12252 bytes
SHA-256: b8b9b9c269789f06ded05a4078e32f641d02a4e51c9d2d04a4724acf2b5946f5