Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba12b8d7e9779988…

MALICIOUS

PDF

72.8 KB Created: 2021-06-03 04:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 09a64d0a3461c43ce93a7da680243ed3 SHA-1: 823ff949ce0e62691a60cb153af40f67fd5acffc SHA-256: ba12b8d7e9779988d60bf66fe8ff861571453be7c2f476984a28d54f492825e8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=cartoon+photo+editor+application PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368488/normal_60422381c6c2e.pdfIn PDF document text
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/lazevo_letazilobam.pdfIn PDF document text
    • https://lusezatakobav.weebly.com/uploads/1/3/4/3/134352635/9222520.pdfIn PDF document text
    • https://punafatig.weebly.com/uploads/1/3/1/4/131408139/fufadabupokan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465277/normal_600fbcbb3b45f.pdfIn PDF document text
    • https://lerorenoj.weebly.com/uploads/1/3/5/3/135390996/ridije_pufisadere_wirubuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470228/normal_6063f81992964.pdfIn PDF document text
    • https://pixizibonemitu.weebly.com/uploads/1/3/1/3/131382366/badupugikepem-witoroxuviwivap.pdfIn PDF document text
    • https://ribosotegolexo.weebly.com/uploads/1/3/4/0/134013239/3d9a0dab1697.pdfIn PDF document text
    • https://rifeseroki.weebly.com/uploads/1/3/4/6/134698736/3963825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421944/normal_6014909bb52e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_60111a2ce2067.pdfIn PDF document text
    • https://bosizeke.weebly.com/uploads/1/3/4/5/134596703/8aa353b607de0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_60399f976bc20.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/dff72342-c95f-4c51-b8f5-98f04276d1c1/funciones_hepaticas_del_higado.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144458781/next_launcher_3d_apk_full_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460c729b-17c7-4e5c-bd83-bf5b819c70f3/dipuxes.pdfIn PDF document text
    • http://naxenuve.pbworks.com/f/pokmon_ultra_sun_and_ultra_moon_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebc72c4a-b7da-4fb3-a43a-31cb17449b93/how_to_reset_my_jawbone_jambox.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_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 4888 bytes
SHA-256: 4adbf47af20b99e894378536bae5ae25a59527e786aa7009f5096b0cf766b068
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 10844 bytes
SHA-256: 7149e9d46031e433c6bcc5e96f480f0160a26b5796c467f7409af2aa7f8f953c

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