Malicious PDF — malware analysis report

Static analysis result for SHA-256 4031f2bc5b5f20b4…

MALICIOUS

PDF

69.7 KB Created: 2021-03-30 23:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 43f8dd257ec95f4984df8c948d9018bc SHA-1: 5b4ee0fbf0fa4baf8cc1108d2adb27a7e525e1be SHA-256: 4031f2bc5b5f20b49328cb8c63af03cc62e766172bf91afa446568640f7205d4
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://soxebez.ru/strik?utm_term=no+such+thing+as+a+dragon+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4859805/normal_6060b97aa4ec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_60210db66baf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371508/normal_601ade30cf554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_6060a4db4a08f.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/ukulele_fingerpicking_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_603128e4b2829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458431/normal_6002126c8a3ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_605a070b62943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421341/normal_5fd2efa81dfea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501356/normal_603179bf39ed4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vunefukovamin.rf.gd/geometry_and_measurement_worksheets_grade_8.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/96349873153.pdfIn PDF document text
    • http://fojisar.rf.gd/zukisanetelaramijuxu.pdfIn PDF document text
    • http://xevorerokune.epizy.com/becky_g_songs.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_34349af39fec4064a9d87cb78c46cec4.pdf?index=trueIn PDF document text
    • http://voturugivorajop.onlinewebshop.net/power_elevation_worship_chords.pdfIn PDF document text
    • http://kileduf.epizy.com/85486934561.pdfIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_dc5478583d1048ac9b7039a1213f3436.pdf?index=trueIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_df6863c30e864ea297e1f5cb82fa59b1.pdf?index=trueIn 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_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 5340 bytes
SHA-256: 41a83c5fd7c9a67e4a1c5aaf2fa7cacade6078d2b1d761c3111a9ff562233cc9
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 9984 bytes
SHA-256: e309758ce05e1ff3b7b5b5573415e4102fe8d4387569fcac6634c541bd1f8f01

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