Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0afaf92736efe4…

MALICIOUS

PDF

75.1 KB Created: 2021-02-26 13:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84515cc233eaffd759cef0d066ea2fd1 SHA-1: 376e840c5e2d6229d4f5db9153a0cb4261b5cbfa SHA-256: 3d0afaf92736efe4b081794fd5086ff27fce482d903c800c8d3d39bcab24acd4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to drive traffic to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=space+hulk+genestealer+painting+guide
    • https://cdn-cms.f-static.net/uploads/4474218/normal_60151865f217b.pdf
    • http://tipofeliluget.medianewsonline.com/75290449433.pdf
    • https://cdn-cms.f-static.net/uploads/4426822/normal_601716aa26dfa.pdf
    • https://cdn-cms.f-static.net/uploads/4388272/normal_602b827ce1bd8.pdf
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/23e236.pdf
    • http://frasqen.online/wemadus2by7h.pdf
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fdbb14bad1a3.pdf
    • https://muxalogedidu.weebly.com/uploads/1/3/4/3/134358485/5140869.pdf
    • https://lozatovetifeg.weebly.com/uploads/1/3/3/9/133999134/6568054.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nufiwimuzobo.onlinewebshop.net/kepubuv.pdf
    • https://s3.amazonaws.com/jefazaxal/franchise_tax_report_due_date.pdf
    • https://s3.amazonaws.com/nitajosasa/desktop_wallpaper_for_windows_10.pdf
    • https://s3.amazonaws.com/buwosevax/84658008308.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dba1.bin
e4d23ed3d57a7912f34184e2fe5435b014ac572178096851e5403f6ea4b0d01e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 5276 bytes
font_01_sfnt_off0000ed73.bin
da4255e3b7ee89d7350a63a62c4a9817670bbd68a85a48475c9116c16801338f
pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 10432 bytes
font_02_sfnt_off0001112c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 4324 bytes