Malicious PDF — malware analysis report

Static analysis result for SHA-256 d370dd22a783c683…

MALICIOUS

PDF

79.1 KB Created: 2021-01-17 00:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e2fef63d67d64793e4427dd01456f26c SHA-1: 98454487773b13c8aacfa372c46cadca74c6bdae SHA-256: d370dd22a783c68341b3bc4ad148aaf48c19c06d0a0d69288818504f657b7a94
244 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with many pointing to disposable hosting services and redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates a link to known malicious infrastructure, and 'PDF_SEO_LINK_FARM' suggests a large number of outbound links. This pattern is commonly used to distribute malware or conduct phishing campaigns by directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://cctraff.ru/123?utm_term=the+girl+from+the+other+side+si%25C3%25BAil+a+r%25C3%25BAn+manga In PDF document text
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/rugubojas.pdfIn PDF document text
    • https://site-1180311.mozfiles.com/files/1180311/kopimoxirolerizox.pdfIn PDF document text
    • https://dolakavurig.weebly.com/uploads/1/3/4/6/134647128/9758913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_5f9dbf3902246.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459935/normal_6001e0caa3a31.pdfIn PDF document text
    • https://wedoweniwan.weebly.com/uploads/1/3/5/3/135308992/0c9ab.pdfIn PDF document text
    • https://site-1174988.mozfiles.com/files/1174988/38886485253.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/jifizo_bamezaje.pdfIn PDF document text
    • https://nulosogitizibe.weebly.com/uploads/1/3/4/3/134317173/2f7db6617d696.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/706a53901fae66.pdfIn PDF document text
    • https://lonitavow.weebly.com/uploads/1/3/4/3/134355974/pupifaz.pdfIn PDF document text
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/niledipudisigex-zapunesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413987/normal_5fc07cefdeb92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_5fdc7f6ababf8.pdfIn PDF document text
    • https://topiropepejepok.weebly.com/uploads/1/3/4/5/134593977/cf2d14cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 5388 bytes
SHA-256: 441592a87149f14fff8265b08f855dbc419692c9caca1e9e4d5228daabf5fbe3
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 10892 bytes
SHA-256: b0e6cfbc4da757f335194a9eec771a2ffa3423692b00376ff2485eebd3745f19
font_02_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 16172 bytes
SHA-256: e023ef9f37ebb9498de13bbf522a52ae91458c70e54f9d640a5f4756df54a3a9