Malicious PDF — malware analysis report

Static analysis result for SHA-256 453574cf2f85be82…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 16:59:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0af1a401d963837764bb9a8b63d47c0d SHA-1: a42c5e1a3940b575f3e87713ef9a21799a1c8a3e SHA-256: 453574cf2f85be82ed2a1995e56d5ff637fe5fb80291c5aea81d770911cf56c4
106 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9993

Heuristics 5

  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=does+eddie+die+in+the+it+book PDF link annotation
    • http://edarudost.online/101466119020tsdc.pdfIn PDF document text
    • http://yarrebitteh.online/tumutdr87l.pdfIn PDF document text
    • http://glossywp.online/bank_compliance_officer_jobs_floridaueqw1.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/kofimiridafurideseb0yf7.pdfIn PDF document text
    • http://bilet-pdd.site/sidopunawefizijew5180s.pdfIn PDF document text
    • http://padlamadla.site/793375347714fzoi.pdfIn PDF document text
    • https://noxazevoda.weebly.com/uploads/1/3/5/3/135348256/8492944.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/perrys_chemical_engineering_handbook_6th_edition_free_download2cqjc.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/5393696.pdfIn PDF document text
    • http://pshcomonhere.xyz/witujcg0fo.pdfIn PDF document text
    • https://rutosediwuxi.weebly.com/uploads/1/3/2/8/132814231/2e487f542773a7.pdfIn PDF document text
    • http://limecash.xyz/how_do_i_connect_my_hp_printer_to_a_new_wireless_network_macg0da8.pdfIn PDF document text
    • http://ooovseanalizi.ru/how_do_i_setup_my_linksys_extender_re6400iirr6.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/azure_blob_storage_speed.pdfIn PDF document text
    • http://mihetos.xyz/nazaruronexabomufadua2xd6.pdfIn PDF document text
    • http://presente-top.store/xubozutorej3tneb.pdfIn PDF document text
    • https://vulakesekek.weebly.com/uploads/1/3/1/4/131438428/3107178.pdfIn PDF document text
    • http://iglivesupportteam.com/how_to_start_share_trading_for_beginners_in_india9xnah.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujewubimowe.rf.gd/xideji.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/blank_scroll_template.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/dukewa.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/peritarimununivowidu.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/momifutebuko.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_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 4776 bytes
SHA-256: 5389f0b3bb773b6e021c8576d774e13989bea9b5f15f56c5907246bc54fca7c3
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 10452 bytes
SHA-256: 5ea0f7bc77d14499c21760c5d34ce1151737142ba92e05cb486712d1efeba445

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