Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb5a97234dcdf17…

MALICIOUS

PDF

79.6 KB Created: 2021-05-22 05:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 5a3938874d769a55f20c2594b6d14666 SHA-1: 30092e3e69f58a4a31d631c84447f3d4ed9d1cdc SHA-256: 6bb5a97234dcdf178698c2d6ab44ecb3081396faea27bbc0f2ff74f4e1aa66c3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://dugedepap.ru/strik?utm_term=how+to+get+the+chisel+and+bits+mod+in+mcpe PDF link annotation
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/f45678d407ca00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_602dd579e6535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402246/normal_5ffa6e014fac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_603e910f94b85.pdfIn PDF document text
    • https://vobasonuniba.weebly.com/uploads/1/3/4/6/134668907/62430aa62c3ab9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_602ea081dc5d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374853/normal_5fcb28c9ed7c8.pdfIn PDF document text
    • https://tolorojefa.weebly.com/uploads/1/3/2/6/132681575/b53706.pdfIn PDF document text
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/7366148.pdfIn PDF document text
    • https://dazutexigamufo.weebly.com/uploads/1/3/2/7/132740900/fotukowi.pdfIn PDF document text
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/8418141.pdfIn PDF document text
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/zusijakazunuxix_puluzaxanumuve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450635/normal_5fdf49880c030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_6030fcd18004b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_60541429dc8db.pdfIn PDF document text
    • https://ginerapaxujivu.weebly.com/uploads/1/3/4/6/134647741/wikeron.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_604cdd0ea2dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484375/normal_6047111c75775.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/aaa1bced-2773-406c-a897-b1c7644c45c3/thank_you_for_your_fast_response_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2ed986-5082-4c58-aa24-c94ae966dcdc/98821975486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4dee561-30f0-4d56-b2ad-c251d8a48ce6/red_lobster_nutrition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11adbda-bac9-4d3a-90e3-0d60cfb6149a/jexutigulevetojudaburi.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_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 5584 bytes
SHA-256: 247de59dfc715c20c5fa0a3db07a98a908e69bc1ee94685802d4e13b8e817108
font_01_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 11036 bytes
SHA-256: eda92af2e781b375326dcde3e3f241fc69477a76939b04778c30bf3792a156c4