Malicious PDF — malware analysis report

Static analysis result for SHA-256 1109e0286959fc78…

MALICIOUS

PDF

101.1 KB Created: 2021-04-08 01:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e9d191226fb33943a9d138cf1e931d8d SHA-1: d4b735cba042a9f9628a0a46c1228922a61836da SHA-256: 1109e0286959fc78a5edaaf3e064ff5b53b12889a84d0ead01f459227b5aacf5
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, potentially to download a second-stage payload.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/strik?utm_term=22+clues+level+6+espa%25C3%25B1ol PDF link annotation
    • http://mebovedu.getenjoyment.net/86695085443.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/vehicle_information_londonl0c7j.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/common_core_standards_california_ela_7th_grade.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/tennessee_odometer_disclosure_statement.pdfIn PDF document text
    • http://seedcraft.online/kolulokewelvj1n3.pdfIn PDF document text
    • http://lynciguest.com/41887977465n4uzh.pdfIn PDF document text
    • http://zexitekaxob.mypressonline.com/adenoma_hepatocelular.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/wogaletori.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/kimone/lijudonizemag.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/46336461610.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/mezofabavaxadexaxogukekit.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/rinevafu.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/72367973948.pdfIn PDF document text
    • http://sedejavuguz.rf.gd/aradhana_film_ke_gane.pdfIn PDF document text
    • http://daparetefofan.epizy.com/togowimejewedomatadifit.pdfIn PDF document text
    • http://wudazebej.atwebpages.com/kisotuzi.pdfIn PDF document text
    • http://sepobifesedapeg.rf.gd/expected_salary_question_answer.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_off00014cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD1 5296 bytes
SHA-256: 6361f95b08a7e373e050ba48950bf357d03882328d9846668d5e058dafe19724
font_01_sfnt_off00015eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAB 11380 bytes
SHA-256: c99e36243fd6601f7582ec1feaff15f6cb589bcaba6e6456daf7e4de2b704307

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