Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61f490986916a36…

MALICIOUS

PDF

79.5 KB Created: 2021-03-16 08:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a7873f0e18fae8715348fd157f6b4d15 SHA-1: 694779bab2573c570f9806e34863edab67fb5e7a SHA-256: e61f490986916a3650885f92cd1c8c4508b3a7eaeec071c635d9f989cf0aa22e
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://midufefew.ru/strik?utm_term=how+to+replace+a+pvc+elbow PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383308/normal_5fdf3c95275d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_601867fac715a.pdfIn PDF document text
    • http://seomagnat1.online/adblock_firefox_mac_os_xdo6ws.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/6iihhxn/42335181944.pdfIn PDF document text
    • http://cashbackk.site/tabla_de_formulas_para_derivadasomd3h.pdfIn PDF document text
    • http://copyright-central-media.com/4123195463670yee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405208/normal_60087d588e9d3.pdfIn PDF document text
    • https://cdn.sqhk.co/renonidofel/Figtohi/music_player_audio_video_player_ringtone_maker_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5fd7cd58b830d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_6042c95843f63.pdfIn PDF document text
    • http://gayerkan.com/194431368424zc10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_604e15a73b026.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/gj5CVgi/bigbang_glitch_live_wallpaper.pdfIn PDF document text
    • http://rewita.fun/rewabe4a6tf.pdfIn PDF document text
    • http://vandify.com/dolufukibevuxeguludasiwaf3lwcm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/73367a47-7c83-4b79-b49a-4c21a62429ca/29572257124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd56c235-ed00-420b-82d1-910cf36dd9c7/29437737689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcbc2716-759b-440e-a66c-cf0d4b0528f8/thirty-six_stratagems_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918a9490-41b7-4ca4-871d-d30244782bd3/hp_elitebook_folio_9470m_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fe2ae4b-fa31-402f-96d9-fc1eea4266b7/lord_of_the_flies_study_guide_chapter_7.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_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 5004 bytes
SHA-256: 1320586ad9e8a30bb4099b5ab599563c422eb1968d2ea16999daec178a7cd674
font_01_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 10560 bytes
SHA-256: 6f0867a2e587708d0ae33ed9f220cb9a2bdf1148678ccb27aecddb6dd898ddc7

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