Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc4f825ef0abdbd…

MALICIOUS

PDF

75.9 KB Created: 2021-03-22 03:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6e5e6e5481c57a49aaab95b72cd23a94 SHA-1: 171dabae5a742edebfdd3a42ec44bc62e8787f12 SHA-256: 6fc4f825ef0abdbd09f0999037640b5fa0ce86aa10486019554efab2d50e91bb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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/123?utm_term=linkedin+app++resume PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403415/normal_5ffc2ad3cfc16.pdfIn PDF document text
    • http://euromarket.pro/tanewirar04t1.pdfIn PDF document text
    • http://nuverlites.online/48714079469wh7ua.pdfIn PDF document text
    • http://komarovskii.xyz/12599689230b8be1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448733/normal_6026cca3df624.pdfIn PDF document text
    • http://brightshopbg.xyz/what_percentile_is_good_for_gre0b99g.pdfIn PDF document text
    • http://keepmaxi.space/nextbook_10.1_charger_voltagen6ce3.pdfIn PDF document text
    • http://rebelliona.online/jupyter_notebook_tutorial_espaol1cw4e.pdfIn PDF document text
    • http://imedo.ru/wofupixegatuvosvrvok.pdfIn PDF document text
    • http://visionnew.xyz/telekabaxojelhgd9h.pdfIn PDF document text
    • http://lotto-investclub.com/geometry_homework_answers_sladeres2xd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_6047f4f1d1f27.pdfIn PDF document text
    • http://vulgargirls.fun/principles_of_animal_physiology_moyes16t9u.pdfIn PDF document text
    • http://onlinetyz.xyz/cub_cadet_rzt_50_transmission_fluid24w56.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/xixonu/masamudipewilefinu.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/72822052993.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/machine_learning_datasets.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/analyse_de_la_boite_a_merveilles.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/jidebixaje.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/kixigopawaxakavila.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_off0000e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EF 5076 bytes
SHA-256: f9e817e9735a778204b3014d16aeee97192f13121987c0a5dbb240036ee55fe3
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 11592 bytes
SHA-256: 0153b6e137212a0ddbb5ab4b5c63ff50a0ff53110780f1880e2867da0a1ffc8a

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