Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dcb8fcef5c6f5fa…

MALICIOUS

PDF

69.6 KB Created: 2020-12-23 04:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 30b4f9879dc8c6faa18d84e4232e646f SHA-1: d84534cb4d70cfcda37944911cca95f9c3e5762d SHA-256: 4dcb8fcef5c6f5fa2edc2494ae3aa832296f0bbef268f5cb440f521dcf03de42
214 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, with one identified as a known malicious redirector. The heuristic firings indicate it's designed to redirect users to malicious infrastructure, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://ggtraff.ru/strik?utm_term=balance+limit+screen+time+app In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_5fc302b93cb7e.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/bevabex-dolisa-ximidigedi.pdfIn PDF document text
    • https://jekomijijupuda.weebly.com/uploads/1/3/1/4/131438685/xuresidamopimuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5fa35fbd76b5f.pdfIn PDF document text
    • https://nasijominazol.weebly.com/uploads/1/3/4/3/134366940/pureg_jotorofud.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/7681421.pdfIn PDF document text
    • https://vumopiwerelo.weebly.com/uploads/1/3/4/7/134730258/wodadutofonod-tilititub-zavukadoxim-timifuvivesoki.pdfIn PDF document text
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/vopuramubewak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413573/normal_5fb43e87765be.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/5877267.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fded23088390d34f38c43e6/t/5fdf71efef735726d26f32be/1608479216655/17788001553.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce3e514a55824081a6acf2/t/5fd20e31c10336458b3d295f/1607601714898/widomizapovuramarelunabul.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dda511f6a41984857aa8/t/5fc480409b1ed035386d2a31/1606713412772/manual_scrobbler_album.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78e0ea4492a057e24253a/t/5fce7eab4c5d49651cf02bb6/1607368363923/71601285307.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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 5128 bytes
SHA-256: 3cc21626d8190c7fe39a5ab7f17e12eb004a468df0946ea10d8a205a3c4e5260
font_01_sfnt_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 11920 bytes
SHA-256: 3b25fcca0f5082ce3b89bbb8244c63c05f42109aa1d2179f5ec509efac02d583

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