Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7b98b5524c67e3…

MALICIOUS

PDF

77.8 KB Created: 2021-05-19 00:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1bfc10d8dc846a0399fc2ad9e614de8b SHA-1: 2e6afcb8a4181d27172089ff53c6c3cab4817c88 SHA-256: 3a7b98b5524c67e341eef7cf3ce2a6e28e4d5e3816bec3f40a9a7ae7ed15f02b
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-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://golowaki.ru/strik?utm_term=relion+premier+compact+control+solution PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459036/normal_6053014384019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_601130206df26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_6011d08de6166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fc79cdff393d.pdfIn PDF document text
    • http://wadupobem.iblogger.org/28998757378.pdfIn PDF document text
    • http://zagadiba.22web.org/dorothy_must_die_plot_synopsis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_6017850366917.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/646ffc1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5fc6c27d5ccf8.pdfIn PDF document text
    • http://juzirafotiwiwa.iblogger.org/consumer_reports_magazine_subscription_renewal.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/wonuresuzomev.pdfIn PDF document text
    • https://vimasideb.weebly.com/uploads/1/3/3/9/133997972/mexikugon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371240/normal_6050cd6cf41cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_600fbb9d13030.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/9763325.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/19f6223f-baa4-4a80-9c8e-396c8a9e27a0/44513879985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cf5b450-aa6d-462a-9d7c-f25a5dd95606/bopumo.pdfIn PDF document text
    • http://tudozujuxijoz.rf.gd/the_ruins_of_gorlan_pages.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_off0000f234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF234 5084 bytes
SHA-256: 300f4bb45eb93e9d6af0fd33f72edbdbff4a80864a315a24c1f0ec45f624e7eb
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 11360 bytes
SHA-256: d51b23217610a518c64a64b7e08dd49769a109816280b141951dd23ed4bf58e7

Open this report in the interactive analyzer, or submit your own file for analysis.