Malicious PDF — malware analysis report

Static analysis result for SHA-256 f860f29f7cef797b…

MALICIOUS

PDF

73.9 KB Created: 2021-01-20 22:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8f06300891eacc4b195a9134c5e63fac SHA-1: cd2b04a04fdc59251352dfee14bb88e71d4b5f4a SHA-256: f860f29f7cef797b251e12d1d090cf1146cb4d58c63f95263cd95179eaa51129
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with a critical heuristic firing for a PDF link farm. The document body is heavily obfuscated, but the presence of external URIs suggests an attempt to redirect users to potentially malicious content. No scripts were extracted, but the PDF structure itself is leveraged for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/123?utm_term=roll+and+write+games+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388424/normal_5f904c975595b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5f9a1850d5db7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5ff304d021955.pdfIn PDF document text
    • https://site-1213673.mozfiles.com/files/1213673/housekeeping_daily_cleaning_checklist_for_office.pdfIn PDF document text
    • https://site-1176410.mozfiles.com/files/1176410/10890846257.pdfIn PDF document text
    • https://xetuvamabur.weebly.com/uploads/1/3/1/4/131409037/vuzewasu.pdfIn PDF document text
    • https://site-1177636.mozfiles.com/files/1177636/51623853069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_5f96740a5e51f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457843/normal_5fef0eea19989.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/xonaxevetaf/tesatemadiluzomenuzunejuw.pdfIn PDF document text
    • http://nawopezor.rf.gd/gavitugixa.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/spring_boot_basic_authentication_resttemplate.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/13571458145.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/gifiwa.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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 5520 bytes
SHA-256: 95912ace722184cbbb683b20d900a2c7cbf8ab75ae077eec941abb6d80172376
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 10304 bytes
SHA-256: 63db49a543c2963c8bcea9ef7dd0a785bbdd25de843f941e60feb3bbd2e56e19

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