Malicious PDF — malware analysis report

Static analysis result for SHA-256 9053a548735f0d99…

MALICIOUS

PDF

75.2 KB Created: 2021-06-12 05:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 140ba84f329f709e205137b3b9c9d6b7 SHA-1: ed6c124a9e0b5b4617f41424f04a19e0677e358f SHA-256: 9053a548735f0d99b781f1be4f5e9588664102efef1de6c069bc843eea688edf
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 0.9996

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://queure.ru/pbw?utm_term=new+song+2020+tamil+mp3+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4503033/normal_605aaaa0300f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489980/normal_603a420c13704.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/b7023d9.pdfIn PDF document text
    • https://xegazoniwenopuk.weebly.com/uploads/1/3/6/0/136011370/50bd4e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487905/normal_6044dbef61a69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478415/normal_6017896e92725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367640/normal_5ffb95abe22d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366388/normal_5ffb145e47dd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426060/normal_5fee024149104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fdc17a0ba6dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_6043f5919bfa3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fffe7e42aaa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5feaf09de0147.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_606cdf34b5663.pdfIn PDF document text
    • https://kukavixol.weebly.com/uploads/1/3/4/4/134485481/wofekadex-rokegus.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/5479ec21-1828-47be-bbba-4f1cb1f65fdd/walipezaja.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/verification_of_employment_sample_form.pdfIn PDF document text
    • http://murenet.pbworks.com/f/5000_libras_a_kilos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe001d90-67f4-43d8-9956-ef59763b744c/xamiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb52c78-efdb-4fd6-91d1-db4172c19444/22655660112.pdfIn PDF document text
    • http://voveras.pbworks.com/f/jiroralolivebuso.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/f/70909944920.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_off0000e6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 5860 bytes
SHA-256: 598d61195f5a45ad54205c4af747edb346059c86cca7996b49d5e610ff9308db
font_01_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 10828 bytes
SHA-256: f03259b03e55658773b463476365e4ecc8b5b6978a4b196ea9b44de72737d5fc

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