Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f112a6a86d1466…

MALICIOUS

PDF

76.1 KB Created: 2021-02-15 07:06:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e54d5dfaa51298aa6265f17b9bb73a4d SHA-1: c79362d0fb1ee6b48c49b506615a6fe7f409364d SHA-256: a7f112a6a86d1466caa973846a9f1cd5ecf80f048f11ecc371315c227fed6b95
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with several pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, further supporting a malicious intent.

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://druttle.ru/123?utm_term=folding+bow+saw+nz PDF link annotation
    • http://regsenatvumen.website/space_run_3dolemz.pdfIn PDF document text
    • http://xubixaxar.22web.org/atualizar_android_pelo_pc_motorola.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/hfggjhC/vimoxikilizepexifosew.pdfIn PDF document text
    • http://rawenspant.online/cashion_crt_fishing_rodsg803s.pdfIn PDF document text
    • http://sokolov.fun/tinkerbell_and_the_pirate_fairy_movie_download_in_hindi_hdb78go.pdfIn PDF document text
    • http://huaweistoreukr.xyz/star_delta_wiringnq02q.pdfIn PDF document text
    • http://replyua.site/character_development_sheet3qc2a.pdfIn PDF document text
    • http://santecmb-sarl.com/najegurunureq5v1j.pdfIn PDF document text
    • http://everydayy.fun/playroom_furniture_ikea0r0o0.pdfIn PDF document text
    • http://idealslimitalia-official.site/152239488569ydwr.pdfIn PDF document text
    • http://theharaka.online/wofovodiwopitedijaqgafq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/davolazupivowi/curso_de_ingles_gratuito.pdfIn PDF document text
    • http://lemibutudigosuv.rf.gd/femojugetoxubuvexopoj.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/bootstrap_4_documentation.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/android_busybox_smart_install.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/vulanabemiretu.pdfIn PDF document text
    • http://joveviziw.epizy.com/marufaxede.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/runokaxixeretejusu.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/invitation_to_consultation_meeting_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 4724 bytes
SHA-256: 6d39e9cc5e200a46493137085b5095ab97aca7e7ede3dd51663c187cd19dbbd1
font_01_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 11204 bytes
SHA-256: 51102fd3dbf8b949bf768fe857e5233efd4aa8820067a15fec602cd7de54ebe8
font_02_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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