Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d25ab5d0391eb7…

MALICIOUS

PDF

66.4 KB Created: 2021-02-20 12:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4bad9f0c5cf1a9d695f8cf3c5faba4cf SHA-1: 21fc8c57ba26604436c04243f74ebb7a02059e61 SHA-256: 47d25ab5d0391eb7c354beaabc52ac516ff3a94ae7d2e68a4b41b1afb3be317c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, but does not provide direct user-facing content to analyze for lures.

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/strik?utm_term=what+reading+level+is+amelia+bedelia+means+business PDF link annotation
    • http://lnstagram-verifedbadge.com/57200163126megoh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_601f271122bf9.pdfIn PDF document text
    • http://pitushok.space/jasexftt42.pdfIn PDF document text
    • https://wufodiwefoveve.weebly.com/uploads/1/3/4/8/134891768/5928310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_5fdbffb8eced0.pdfIn PDF document text
    • https://boginajidu.weebly.com/uploads/1/3/4/6/134693166/logefuputo.pdfIn PDF document text
    • https://limuvowefegepud.weebly.com/uploads/1/3/4/5/134509231/938d761a2b478c.pdfIn PDF document text
    • http://copyrighthelpcentral.com/him_eesh_madaan_video_youtubeqpj7e.pdfIn PDF document text
    • http://lavkavkusa.store/rice_burner_exhaustt5slu.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/6064033.pdfIn PDF document text
    • http://monoga.space/descargar_sonic_unleashed_ps3_isog7t5k.pdfIn PDF document text
    • http://bas-vorota.ru/big_rich_town_sheet_music47qs9.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/gumamiferux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_601f9a193a278.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/vukusa/manual_usuario_citroen_c3_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/46616468813.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_off0000ba68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA68 5224 bytes
SHA-256: 8e17179a95bcd942fc1524ab11e2593427fd103130358d17dae719c02503c278
font_01_sfnt_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 9852 bytes
SHA-256: 43b9bb64fc8aee3b1bcdbe6fc697a1eff23556506e9387e49ec5967ce8aebe5a
font_02_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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