Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d4d6ecba44e2bd…

MALICIOUS

PDF

87.1 KB Created: 2021-05-29 08:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a956ae1f4b6f5ed96bb47c21c9017afe SHA-1: 5077c7e9b5ab9540cad0297f29821c469f9d4832 SHA-256: 29d4d6ecba44e2bde4dbfeadf4b37a06f1744e41fc37e5a87f27950c471f1a45
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a mass of external links, with one identified as a potential SEO link farm. The primary URL, 'https://leonvi.ru/strik?utm_term=cfa+level+2+curriculum+pdf+2021', suggests a lure to a website, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=cfa+level+2+curriculum+pdf+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387433/normal_606cb85abd948.pdfIn PDF document text
    • https://geduxajof.weebly.com/uploads/1/3/4/3/134328978/d96e0.pdfIn PDF document text
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/3957524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_5fd375fce3b15.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/7628022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_6001d342a1090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_601fb39fe5e69.pdfIn PDF document text
    • https://lozofedexipa.weebly.com/uploads/1/3/5/9/135969573/2209114.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366633/normal_5feb15b6b769a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_60490ff7b933b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413019/normal_602c409a600de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458145/normal_60114509c6beb.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/e75b941f-103e-45c8-9e7b-2e4eae79525c/99916308889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b346b14-8b14-43d9-a816-d1f8fe634350/12357492421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bd64785-72cf-430e-972a-46d7bef627a0/fezavuwasozalilag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c279b51c-bdfc-4a51-b984-90465a231e60/vawodenanelojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7447f4d-3024-4da7-83cd-2c7d4b5e9050/front_end_estimation_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35599524-f0cf-4114-a221-6a07e39de537/nipunemewifedizezisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc203cf7-a2e8-4228-b6c7-c2ddb7849d68/western_unimount_plow_pump_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f41827-1d92-4d48-afdb-de2a5cd453cc/cara_belajar_efektif_dalam_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/557595f6-62c4-472a-a553-891b4664284b/engine_code_p2106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28a69e4c-551f-47fd-a9b1-0de00baf7169/26_cuentos_para_reflexionar_jorge_bucay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ffd6bff-0c76-4c42-a43d-3f9769ff9bd1/36786242350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83379a60-9f6d-4a1c-87b1-017430fa743e/how_to_say_beautiful_lady_in_jamaican.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_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 5412 bytes
SHA-256: ba15534f70aa200cbbdb7a6ce0ba006a7380e8fcba645db925161ba6f0b82f73
font_01_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 15200 bytes
SHA-256: 622b1d2a91dd4bd95d75606985b13885ce34591b6d0e1f38d09297489d211a98