Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d26cd2abd66c401…

MALICIOUS

PDF

68.1 KB Created: 2020-11-17 20:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ac601f72bfd8a56dc5f6d2c8b1f0eee5 SHA-1: d140c4d3111bb7267391b0f701870fce008d8d35 SHA-256: 4d26cd2abd66c401d89a3d799d0ba37382fdd7bd807f0e797184b89c1c338212
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/123?utm_term=homelite+14+chainsaw+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5f8b46c9105f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f872c1504232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376088/normal_5f94e42e26dfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5f8ce280df249.pdfIn PDF document text
    • https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/c8c58dce257d1.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/1a27643b41869.pdfIn PDF document text
    • https://xameramavojipav.weebly.com/uploads/1/3/4/2/134265998/durozakasaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422890/normal_5f9fbae1a6be5.pdfIn PDF document text
    • https://robitejipesiz.weebly.com/uploads/1/3/4/3/134375849/44ad27592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5fad8a2d896dc.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/muwatorewerobekun.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/1516252.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widofafane/best_games_in_slotomania.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21e154a-4a4d-499e-83d9-d0dcc3f4dbb7/fakorojolub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd1a620-3157-4836-90b7-3c66b7e1f6d1/tegiwokubi.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_off0000cef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF9 5136 bytes
SHA-256: ec2e41c05e7ea3c6f31c8c9f9eb8bf6c1b0c1f83bbf258e6371460731bbd2d3c
font_01_sfnt_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 10376 bytes
SHA-256: 39e9bc32cf76604f6c21a311d69cef2fb49bcb7cb15a4c85223b26e847d74aeb

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