Malicious PDF — malware analysis report

Static analysis result for SHA-256 11146e3dcdbfa781…

MALICIOUS

PDF

71.6 KB Created: 2021-02-23 03:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9fd8d28adf434ffdbe824e296e72633e SHA-1: d949f06018ab9bae1f2e8fba23d79f1ae500543b SHA-256: 11146e3dcdbfa7814aa83a6e84bd29d5d77eb6d5a858c304b11acea74c0b006f
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/123?utm_term=college+algebra+and+trigonometry+online+course PDF link annotation
    • http://jumpfs.space/fojesosusemabisareblbla4.pdfIn PDF document text
    • https://ninobajoxakatud.weebly.com/uploads/1/3/4/7/134702009/wetemudo-refuxiki.pdfIn PDF document text
    • http://useporte.xyz/62488182114dnhol.pdfIn PDF document text
    • http://tublitalia.fun/15968610468yf7re.pdfIn PDF document text
    • http://glawerry.online/imd_world_competitiveness_report_2018l0m2t.pdfIn PDF document text
    • https://nugakiru.weebly.com/uploads/1/3/6/0/136050310/8214603.pdfIn PDF document text
    • http://fsfsfd.xyz/literature_review_vs_systematic_reviewwt2oj.pdfIn PDF document text
    • http://robinmani.site/fedex_tracking_number_example_on_label85g3z.pdfIn PDF document text
    • http://promooffer.site/voditedajo36c4f.pdfIn PDF document text
    • http://marketeuro.pro/vikuwemgka8k.pdfIn PDF document text
    • http://ketosimple.online/89070157370ojqje.pdfIn PDF document text
    • http://spiritstudio.ru/67529536697kcoxh.pdfIn PDF document text
    • https://zosifoke.weebly.com/uploads/1/3/0/8/130813504/6451775.pdfIn PDF document text
    • http://repochka.site/56452271883pq8pw.pdfIn PDF document text
    • https://fawirato.weebly.com/uploads/1/3/5/3/135392883/3375397.pdfIn PDF document text
    • http://priz24.site/summoners_war_wiki_vampire_lord02gte.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA06 5404 bytes
SHA-256: 04fb89175501e2415f03cc41af1c6c7154ec0a4db279ada1fdf0adf0efd3b2c0
font_01_sfnt_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 10900 bytes
SHA-256: 875b0e9c83faa20c593acf53cdf36cbd588334e820ae3d58070428c0d0ff016c

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