Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8655824ea1ea8c2…

MALICIOUS

PDF

77.5 KB Created: 2021-03-21 08:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 19e664479776db2e80c3817b3c33d1c3 SHA-1: 2e82f080b37d12a4c6ded5639a46517b6962bc4c SHA-256: d8655824ea1ea8c27a90ae6406c00a18667aa8bf895d610bcbcf7e154abb64ba
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1553.005 Security Software Blocking

The PDF contains heuristics indicating it is a link farm and has been flagged by ML classifiers as malicious. Notably, it includes an instruction to disable security software, a common tactic for malware delivery. While no scripts were directly extracted, the presence of external URIs and the overall detection pattern suggest it's designed to lure the user into a compromised state, likely leading to a second-stage download.

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://resalured.ru/123?utm_term=chrome+keeps+saying+ing+proxy+script PDF link annotation
    • http://wimuzawoxi.getenjoyment.net/6476064305.pdfIn PDF document text
    • http://parhelifrl.space/2nd_grade_math_solsgu6jg.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/jasereluleravawan.pdfIn PDF document text
    • http://botanilix.mygamesonline.org/how_to_start_doing_tai_chi.pdfIn PDF document text
    • http://3gusevshop.website/gazekosesixox4hzcl.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/amigdalitis_bacteriana_tratamiento.pdfIn PDF document text
    • http://rofuzixaveminup.iblogger.org/canzoniere_magnum_download.pdfIn PDF document text
    • http://wetepuzasuvuroz.22web.org/popafapiv.pdfIn PDF document text
    • http://xofitazuregokud.mywebcommunity.org/zodikojubilaz.pdfIn PDF document text
    • http://wgathering.org/88671910859x3dnh.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/what_is_the_theme_of_on_the_sidewalk_bleeding.pdfIn PDF document text
    • http://save50it.pro/demutaruxhvlh.pdfIn PDF document text
    • http://bimoriz.getenjoyment.net/59901875120.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/pibabopuduj/delaware_surf_fishing_report_2018.pdfIn PDF document text
    • http://xawezukazekexi.epizy.com/befevina.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_95c42186d6b04f8eac49d2450537bb97.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_2733f6583fe249b18b96cec4a31e1b16.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_403b173fe25b46b385786e5909ba72e4.pdf?index=trueIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_14438fb34d2d4e7994a0e501540a84a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gifiz/horror_hollywood_movies_tamilrockers.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/50979096221.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_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 5456 bytes
SHA-256: c9d1d1f89603b344d7571a89e73190190c3cb8abbcad892861a90b8b24f64ccb
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 10988 bytes
SHA-256: 699c7735ec2762245e44b6de176a884edb6bd758884c9be8a14c54018f4311bd

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