Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bde9ae1b898d3c7…

MALICIOUS

PDF

96.9 KB Created: 2020-12-20 03:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: edd7d69c58504c7e1aeb063130c3f08e SHA-1: 709d8c4744678262500df031f276c4197d930b4f SHA-256: 5bde9ae1b898d3c721e2600d5eb1115183f84de70f90f68bb187b8fe512bffe6
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external PDF documents hosted on disposable domains, likely for phishing or SEO spam purposes. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content.

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://trafficel.ru/123?utm_term=were+the+pilgrims+puritans PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444351/normal_5fbbca70685a7.pdfIn PDF document text
    • https://lonodoxelu.weebly.com/uploads/1/3/4/3/134305804/zobokidaditabuliti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488842/normal_5fc603b2b0994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_5fbc59f45fc6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5fa4a690edd71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f9858707ef1c.pdfIn PDF document text
    • https://gegivibubijob.weebly.com/uploads/1/3/4/5/134507206/6a1e841f4.pdfIn PDF document text
    • https://nebijuwako.weebly.com/uploads/1/3/4/3/134376342/wixarokire.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460690/normal_5fcea5c9159b8.pdfIn PDF document text
    • https://fazatirogefo.weebly.com/uploads/1/3/4/4/134462354/rubugilaziz.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/dawerab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407983/normal_5fc56e587e8d1.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/b57ac.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9E 5248 bytes
SHA-256: 9a36890376d1f453847f9f62534b8c3573bc08a5c977e5e12ce0c0fe5f3fcf66
font_01_sfnt_off0001515e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515E 10976 bytes
SHA-256: de67634fabc161413493b84b4fc10cf4ced5697410dd89634bcf440ce0365c10

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