Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec54b064c754e884…

MALICIOUS

PDF

88.8 KB Created: 2021-04-26 10:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fb797525a392d83df6528e4ccac022d7 SHA-1: 233ba413354fa41df5aa84bb0c929826f8e37c0a SHA-256: ec54b064c754e884f447f726172f4bcdcebea860bdbe800bd481f45335ef1995
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to host a malicious payload or redirect to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a 'Bayliner 175 service kit'.

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 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://gimoguvi.ru/strik?utm_term=bayliner+175+service+kit PDF link annotation
    • http://gemapijipepegi.22web.org/charles_campbell_college_uniform_shop.pdfIn PDF document text
    • http://alifan.store/75547475902gxe7c.pdfIn PDF document text
    • http://rokamawu.iblogger.org/google_spreadsheets_tutorial.pdfIn PDF document text
    • http://xusegerobexusag.iblogger.org/fleece_bed_sheets_walmart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5febb40c659d6.pdfIn PDF document text
    • http://table-wait.com/99588770133zukl1.pdfIn PDF document text
    • http://gonimuliveza.22web.org/59185598222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5ff13a14efd15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_6042441a71d2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cfae799c-d04a-4395-b2c2-700dffd2ed5c.filesusr.com/ugd/15504a_47228ece5f9d4478a90a215f9cb67582.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/78867256403.pdfIn PDF document text
    • http://rebokomixuxoj.epizy.com/koreader_scroll.pdfIn PDF document text
    • http://godidab.epizy.com/povabupujopoxabokesas.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/fikixokotitanigodukamodo.pdfIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_c583af6ab97b4ba1a2228c1afd4882b2.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_bc6610e0ff9b4ca7b42e204fca9cfc8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/76344482712.pdfIn PDF document text
    • http://vopepajip.epizy.com/analytical_mechanics_goldstein.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_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 5324 bytes
SHA-256: 183dccb5d8e2044d76beedbffef37f7e959cf503dd9bfb33e6bd9b4208b16372
font_01_sfnt_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 12200 bytes
SHA-256: ea61678346e565a409a0d42918d791f351ab9ae1a56c87c1fd468f0c038c8054

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