Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ec3a0f8f1557a5…

MALICIOUS

PDF

80.4 KB Created: 2021-03-26 05:50:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba615f4cc9b6507216e88893ee1eb131 SHA-1: 5e7fb3be309722ead12fe42c5632625ce7ed3df3 SHA-256: a8ec3a0f8f1557a5d306942a8c387b5329ef653ce37a01dcc9715d7db13d45dc
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 0.9996

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://druttle.ru/strik?utm_term=kidde+kn-cosm-iba+recall PDF link annotation
    • http://islandlandscapesbb.com/10420360971x0cf6.pdfIn PDF document text
    • https://cdn.sqhk.co/kerinetivama/OSjdha6/luratedoraxemivido.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480581/normal_60163b154c6af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444636/normal_602fdd53ea761.pdfIn PDF document text
    • http://hiziryigit.online/87561196539vd46x.pdfIn PDF document text
    • http://bitsracing.net/betaxagonozufalonetuwawiuobx.pdfIn PDF document text
    • http://yatvoyya.fun/97403231587u3f4l.pdfIn PDF document text
    • https://cdn.sqhk.co/tajugajobib/ignhdgf/fekuvelazekabavutokijuja.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/texto_narrativo_estructura_y_ejemploo5wwc.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/fotibhh/memunivanenimiwekipinu.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/betefowubevat/sivijudinananoda.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxefemebidaz/the_power_of_the_powerless_christopher_de_vinck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdd973a5-127b-4045-baa2-50e98ab14c53/personajes_principales_y_secundarios_del_libro_la_metamorfosis.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/does_yamaha_psr_e363_have_weighted_keys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd304f9-69fb-4cc4-9c6e-a4a7320f8e18/how_do_xbox_360_wireless_controllers_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8065469-f576-4eb5-beaf-32f4adb3ffba/black_stone_cherry_the_human_condition_gold_vinyl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20b9607-1e21-4eb6-8c11-5d90f148265c/who_is_miss_america_for_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecfcd80f-c03e-4906-acc2-4af4a4c848aa/ponupafupupulaju.pdfIn PDF document text
    • https://s3.amazonaws.com/borokegujuzero/164486031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091d4760-5618-48e1-9af3-916def6ebd8b/crown_xti_4002_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b569652f-1fde-4c80-a223-e0caea2b1a3d/57755231582.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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 4996 bytes
SHA-256: 20bed1a49793ce5430d8c2556eac0bc42df8b1af08e4c92782bddf578eb1b4cc
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 11096 bytes
SHA-256: 5837b69d891ccef539e6ccbe16b06abbc72d62d78e4b7c66d7de56fbecc9fc1c
font_02_sfnt_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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