Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f1c0f44108ff97…

MALICIOUS

PDF

78.2 KB Created: 2021-05-07 23:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: afd8a2d71cd9e04fda82faf17a973520 SHA-1: 20e551e3c5c2f162aaa53fa1881a3103ca6f6f43 SHA-256: 55f1c0f44108ff9790b7fcec8757eb958b04cbce89ffeeeb554ec3821c8ce2bf
186 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'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One embedded URL, 'https://jottigo.ru/strik?utm_term=how+to+install+drive+belt+on+murray+riding+mower', appears to be a redirector for a search term, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://jottigo.ru/strik?utm_term=how+to+install+drive+belt+on+murray+riding+mower PDF link annotation
    • http://sijemogezabusa.sportsontheweb.net/travel_rock_ficha_medica.pdfIn PDF document text
    • http://dajexori.mypressonline.com/computer_aided_engineering_drawing_vtu_solution_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378149/normal_5fef4e283902e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_6058439511390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462678/normal_5ff0f6c7c9385.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/solve_quadratic_equation_worksheet.pdfIn PDF document text
    • https://kafaxidaduxeb.weebly.com/uploads/1/3/1/4/131438036/3937813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_6062ba584cd00.pdfIn PDF document text
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/9d2136688f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_6067668f369a7.pdfIn PDF document text
    • http://kutegexuwudaro.getenjoyment.net/89467762023.pdfIn PDF document text
    • http://movizopolu.medianewsonline.com/elan_touchpad_driver_windows_10_toshiba_download.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/resonate_nancy_duarte_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_9e65382a2aab42659553106fb9d97c52.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_34b068c9a2e94889822733a5f062d400.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_7e3c5e1440c34cdda9f7c59d6842da48.pdf?index=trueIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_b695068167164f89b314bfceeca25ac0.pdf?index=trueIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_c275baf1373347638be572e67ee799eb.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_4dd1e48f27cf42ddbe886872fa2f49f8.pdf?index=trueIn PDF document text
    • http://tevefetilojas.atwebpages.com/poditejejune.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_bf093e82fcc64dc8a693e2cd32b6d5ad.pdf?index=trueIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_c4d7307f5f894ccbbeedc2895a0d19d6.pdf?index=trueIn PDF document text
    • http://sorisavitekinuj.onlinewebshop.net/vapajojamigubiluzolefatig.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_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 5500 bytes
SHA-256: 1daec71bd8ea0a37b15e227810da992d754517937bc623ec485da04159c60067
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10612 bytes
SHA-256: d402ed34cc60a6bb7b2fad2b5bc5ce28b47a65934e55d1c6496ce8fa9f68fb80