Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3a5792562b1516…

MALICIOUS

PDF

73.5 KB Created: 2021-06-04 04:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 69800ab89bd4057cb2458432ebbbbdfb SHA-1: 8db8ec9566d4c06cd44c4c1c9c60deea8723353a SHA-256: 0f3a5792562b151623bcf4e387b108d6598f977235e00270ace49e0b47a461f5
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or SEO spam lure. It contains numerous external links, many hosted on disposable domains, directing users to various PDF files. The primary URL, 'https://nomylo.ru/pbw?utm_term=workshop+manual+mitsubishi+pajero', suggests a pretext of providing a workshop manual to entice clicks. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to drive traffic to malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/pbw?utm_term=workshop+manual+mitsubishi+pajero PDF link annotation
    • https://marezupudi.weebly.com/uploads/1/3/0/8/130874377/pududa.pdfIn PDF document text
    • https://fovinekepug.weebly.com/uploads/1/3/4/5/134587719/35def43311629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_60117d7645f53.pdfIn PDF document text
    • https://doxujivadew.weebly.com/uploads/1/3/4/8/134875716/wikadunoladop.pdfIn PDF document text
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/baxepo.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/3777444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_6068738a8d350.pdfIn PDF document text
    • https://nodazijokavi.weebly.com/uploads/1/3/4/3/134315007/kezapinejaser_joruwawabikorin_potulowew_tozigarukevef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_5fd1c3eec1cc8.pdfIn PDF document text
    • https://fegikunula.weebly.com/uploads/1/3/4/4/134482285/9893d231.pdfIn PDF document text
    • https://fanapakukole.weebly.com/uploads/1/3/4/7/134756501/4884891.pdfIn PDF document text
    • https://tozupefiga.weebly.com/uploads/1/3/4/2/134265365/547230.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/xowopatupewobi.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/acc17290-890e-463c-9815-a4874d95a35d/galat.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144450531/get_your_ex_back_super_system_download.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144579963/varogijaw.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144508605/losobasasoxibasutafa.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/f/software_test_estimation_template_xls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326cc3ce-84c7-4cdf-8490-50ab8b026999/dashing_cm_bharat_movie_in_hindi_download_1080p.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B5 3192 bytes
SHA-256: 451f1b7a8753666b5145bd0f2016e607f652045ab3276149e3b4e3ea85ea651f
font_01_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 5352 bytes
SHA-256: ea2ec3b51da23572d159628d5e389c51318db19f9c76c27d5d8d7f1f6af0d274
font_02_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 10708 bytes
SHA-256: 2c76ddc02fc1fae3b4be62940578a1535db676490892fa25b5908853e06a21e4