Malicious PDF — malware analysis report

Static analysis result for SHA-256 b688cc264d3cb0a2…

MALICIOUS

PDF

67.2 KB Created: 2021-03-12 01:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1a33d733ebc36f5ebb0c5251c0b809ef SHA-1: 5487944b16d733fc6bcd74f7905ce4e852791ca8 SHA-256: b688cc264d3cb0a23ef39e372782efabc063c65dde3cbbafbb708239fa321749
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 0.9998

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://vilenefex.ru/award?keyword=livro+energia+e+meio+ambiente+pdf PDF link annotation
    • http://usacreditmonitoring.info/biwusepolazedow6oxak.pdfIn PDF document text
    • http://insuranceautousa.com/sheet_metal_flaring_toolf7d90.pdfIn PDF document text
    • http://nesobaka3.xyz/56963899461qmjwf.pdfIn PDF document text
    • http://foodguideblog.com/battery_health_check_android_apptpwrm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5fe6f74c9c53e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_600ce82015a35.pdfIn PDF document text
    • http://brightshopbg.xyz/intoxicacion_por_barbituricos_pediatriar289v.pdfIn PDF document text
    • http://uablog.site/problemas_de_dinamica_resueltosd8v8s.pdfIn PDF document text
    • http://girlita.space/fesivaxufiwl1u5f.pdfIn PDF document text
    • http://belplitka.ru/how_to_adjust_apple_pencil_sensitivity01of9.pdfIn PDF document text
    • https://cdn.sqhk.co/daxerarugak/chhIkiF/99135029583.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/hhjbnir/97940380589.pdfIn PDF document text
    • https://cdn.sqhk.co/kidobogi/Gmgjage/94263055780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_600b77c07922b.pdfIn PDF document text
    • http://filanion.online/97388306891n1oh0.pdfIn PDF document text
    • http://trujillostacoshop.com/assassin_s_creed_origins_strategy_guidem0kf0.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/ielts_listening_test.pdfIn PDF document text
    • http://texno3ua.com/yaesu_ft_950_service_manuallzl66.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://peledopa.myartsonline.com/digitech_vocalist_live_fx_power_supply.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_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 5292 bytes
SHA-256: 6ae05082bc1cc7bf4826a401d7e07aa4591a382153911653f5f843ba9eb8786b
font_01_sfnt_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 12524 bytes
SHA-256: 35a0d32b44dd540bea5f47e0253ee3f20d879ab260732df98264c489edbc106f

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