Malicious PDF — malware analysis report

Static analysis result for SHA-256 f431038b199f91f7…

MALICIOUS

PDF

81.2 KB Created: 2021-03-26 03:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b40ef9c4ee991abb25d4d56acf946523 SHA-1: b44197c932e0de325e2d5f3a7fc7a7177c7db852 SHA-256: f431038b199f91f701c7e984fd868da76f6f3b157061e774322ac75e62302bd1
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two pointing to known malicious or disposable hosting infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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://yafferge.ru/strik?utm_term=what+is+central+processing+disorder In PDF document text
    • http://tonufunevozapiv.iblogger.org/how_many_calories_does_a_medium_sweet_potato_have.pdfIn PDF document text
    • http://ig-copyrightviolation.com/52440623506p8kd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_6040afa11b06f.pdfIn PDF document text
    • http://betmoy54.com/27859633667zy209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_5fe6a026da662.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/nobivisidetekovet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5fdf0ff097090.pdfIn PDF document text
    • http://fortuneocredit.com/wuwuzor5tr3x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495269/normal_6012190d9240e.pdfIn PDF document text
    • http://gunenekaroz.mypressonline.com/la_la_land_audition_sheet_music_free.pdfIn PDF document text
    • http://salearea.pro/face_mask_for_toddler_patterntse4g.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/bhagavad_gita_in_telugu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zupenafud/interior_design_course_online_free_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6856fbb0-b63a-4eb5-be86-1ed810921a5a/visuzirige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52ce55f-d30b-4fde-b175-8f412be9c228/44120228141.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/6962227496.pdfIn PDF document text
    • http://suwuriru.onlinewebshop.net/cheats_for_blood_bowl_2.pdfIn PDF document text
    • http://ludugatitabi.atwebpages.com/30133818815.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/cars_logo_with_name.pdfIn PDF document text
    • http://fisumude.rf.gd/25315927046.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/diabetes_mellitus_diagnosis_and_management_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b32943-671e-4ffe-8200-8297a5b74b6b/zavadepolimidisafoguge.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_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 5348 bytes
SHA-256: 9f26294c1a85d7f09a19381d1bd8212451a88e74a3eeda646cb2256c24b8c4f0
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 11628 bytes
SHA-256: df58e9189130f7e15edfd7817bb6c3851d04b54ed05ae09a5c17adf5cd51053d