Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb0c5ca9528e15f…

MALICIOUS

PDF

78.0 KB Created: 2021-06-10 21:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7b8c87cd600c263c7e9370af72a47894 SHA-1: 3bdd3af09f7362eb831c2968ee1ebd0d1c012734 SHA-256: ecb0c5ca9528e15f1a105f282e78f70b476c857f63f691771646577b5ce530db
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 0.9995

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://crysiq.ru/pbw?utm_term=steel+portal+frame+design+example+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454811/normal_5fff10ed6e657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_603103ae717be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403429/normal_5ff6689623af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_6062d9eb8129d.pdfIn PDF document text
    • https://meverofukibax.weebly.com/uploads/1/3/4/6/134620555/5347cec04.pdfIn PDF document text
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/nopizabuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476285/normal_60bb256de8b00.pdfIn PDF document text
    • https://fuxopejebema.weebly.com/uploads/1/3/4/0/134018858/8348677.pdfIn PDF document text
    • https://midezotadodagof.weebly.com/uploads/1/3/5/3/135326840/6e99411.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/e2328d0e68c6e.pdfIn PDF document text
    • https://gemitipob.weebly.com/uploads/1/3/4/4/134474898/58c69030278c4.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://uploads.strikinglycdn.com/files/5ca60601-c883-4452-bd04-4811b39758a5/alphabet_flash_cards_free_printable_no_pictures.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/duxupatunuraw.pdfIn PDF document text
    • http://pojaweku.pbworks.com/f/tokez.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/how_to_play_clash_royale_on_chromebook.pdfIn PDF document text
    • http://lipovosufuk.pbworks.com/f/android_9_for_redmi_note_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ce0f74-7e90-46f3-a6b9-293b890bdc63/fabula_de_esopo_recontada_por_ruth_rocha.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/w/file/fetch/144501672/59295880005.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/f/29230698794.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/craigslist_indianapolis_indiana_free_stuff.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/context_clues_worksheet_7th_grade.pdfIn PDF document text
    • http://jumogitakos.pbworks.com/f/11779401856.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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 5320 bytes
SHA-256: c83c6d662c236b3a6a7a88704006b8b0f87bbb3fbe23dfa880b851d14c2db32f
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 10608 bytes
SHA-256: c0cf6aaed83008a3fbd8c33bc0ef38fb749becc48c4dcbbdf419d73b42e8d433
font_02_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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