Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c0a82440a6e60f…

MALICIOUS

PDF

78.5 KB Created: 2021-02-18 10:54:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 003acaa7e95a11a898e9d59a5f244e8b SHA-1: adef5b323298568c4ec7fba4f17516a562460e72 SHA-256: 09c0a82440a6e60f6772d96e7e7cfde8a193de4a0b5320306d4e4d89865d52a8
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 or trojan variant. It contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the sheer volume of external links points to an attempt to redirect users to malicious content.

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://maypoin.ru/123?utm_term=dark+knight+returns+joker PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417045/normal_60170396ad958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5fe745e8c2f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5fe8ff6433749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375896/normal_5fedf65b0bd15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fe1652e99090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_602c5844db5d6.pdfIn PDF document text
    • http://fojozefamofu.22web.org/perfect_square_binomial_worksheet_with_answers.pdfIn PDF document text
    • http://unreguezff.rest/benuwilenatamolicz173.pdfIn PDF document text
    • http://ecoterritory.store/432447482479o2e3.pdfIn PDF document text
    • http://redpandarecycling.com/bewavixewisaxodamopumajputvw.pdfIn PDF document text
    • http://1xbet-regi.site/tablet_messenger_app_download0mckp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456712/normal_600f60eb1c1ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_6012b78c78f2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370304/normal_5ffb66e7895a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5ffb8097af90a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirejazanapo.epizy.com/how_to_calculate_manpower_requirement_in_construction_excel.pdfIn PDF document text
    • http://komoxam.rf.gd/21087251378.pdfIn PDF document text
    • http://sisuwexiwidal.epizy.com/pezobapeferuvepisurav.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_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 5052 bytes
SHA-256: 51de358b89cfaa99f7e3e862e10eea98b38e5981c9fbb46fb1d7f69f2670ea43
font_01_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 11256 bytes
SHA-256: 5065ae9a42ffa75b76eecb163a99939a00f0669815c9fcb73e8f9480454add7b

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