Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea815b50da0c0622…

MALICIOUS

PDF

81.7 KB Created: 2021-03-29 09:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5e24e7527f3e59beead9f1078b969fbd SHA-1: 84f79f8707fabf9cc91a9956a3866be61f24f5dd SHA-256: ea815b50da0c0622fedb0ca13c8ab0333fc22d1716e00060a1db224ecb6cb2a1
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 0.9992

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://gimoguvi.ru/award?keyword=cancer+de+prostata+articulos+pdf PDF link annotation
    • https://cdn.sqhk.co/rivitovolu/8jj4jgA/rangers_costume_photo_montage.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/hiAi5hi/93946179849.pdfIn PDF document text
    • http://difodalutovirub.iblogger.org/neon_pink_acrylic_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vituxezij/5hdrT2h/pagadugolilivubavim.pdfIn PDF document text
    • https://cdn.sqhk.co/kegimovotol/aoW34U1/broken_bones_kaleo_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_3ca786e510ab44e18ffc4a5ae33a5969.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/suffix_word_endings_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/cheat_sheet_rules.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_a9641882d34f41dbb83cd2cef9ec9258.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xetasif/windows_7_os_iso_microsoft.pdfIn PDF document text
    • http://befatig.epizy.com/sukenetototugaxutigak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39aeda9b-f34c-4f0b-a59c-ca4ab2fe212d/jesevisapalotete.pdfIn PDF document text
    • http://sawezigulafufa.epizy.com/15976213595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3e8bb3-9728-4dec-9671-fee3cafdd8d8/kufikog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0426323-b9c1-469a-8f81-4682d0b9b298/kowozowajutew.pdfIn PDF document text
    • https://f4e740b0-69d0-4d5c-a0c7-362dc6b2ad6d.filesusr.com/ugd/0356fc_ea3ac5e4f6da49acb2131d04ea40d536.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_b4ac7ae632234ebaa443c43147a36177.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af289446-8c77-4066-a3e1-e9d3c3dcb521/fodobal.pdfIn PDF document text
    • http://dibulokesimerog.rf.gd/pokemon_book_for_cards_uk_booster_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f563ecca-dfa4-49fd-8d19-4363d8f75d15/5255724665.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_470c19e77f27444fa824551d728d4fd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf44837-821c-4727-a22e-c0c6716a1773/what_size_are_toyota_corolla_wipers.pdfIn PDF document text
    • http://zororeka.rf.gd/73064278658.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_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 5052 bytes
SHA-256: ab6d568a062b19964889459e2ecf674883dfb235076242378ba6b4af0e2957e0
font_01_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 11488 bytes
SHA-256: d46323418e582c47bf0c71126900f942676ae80d40e09b83003c667f5e6f4009

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