Malicious PDF — malware analysis report

Static analysis result for SHA-256 3830a0b6ef7f420c…

MALICIOUS

PDF

78.2 KB Created: 2021-04-14 02:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7425d85078c5b75551ccfcbd8f079924 SHA-1: 51d0a9bffb0a850d2f67cedfc125722fed3bbccc SHA-256: 3830a0b6ef7f420c9c1812ce1830ff612d6f682311d4c02fdb272e9e42eaa3e8
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://jacksth.ru/strik?utm_term=attack+on+titan+season+4+characters+death PDF link annotation
    • http://mujubow.getenjoyment.net/41979717867.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/87175859979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6010484349543.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/descartes_meditations_summary_2.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/wajutuduxomije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_6061f2730fe52.pdfIn PDF document text
    • https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/2245383.pdfIn PDF document text
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/6301606.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/d3f01668-e0fc-4d89-bbf6-9783123a5b76/72636279152.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_96f8bd30d78045bf8e5e6b2863644430.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e68702-f5f2-485f-9c41-4af3f4153894/a_court_of_thorns_and_roses_fanart_lucien.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa25b5c4-913e-4343-88ad-d3f01a01161b/zasoboma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f37d80d-6eed-4d6b-bcec-3211f4a49a94/jiruxajikomizo.pdfIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_017e78a861744098bca327c9dc609d7f.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_36da2cf1785041f7b3d1013685658bd1.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_ecd9f8165d1a420993c94ec553be85fb.pdf?index=trueIn PDF document text
    • https://5457524e-bace-410a-9ce7-c8d8bc0eedea.filesusr.com/ugd/f0ffd0_2740b493daf84dd694fd4e79193f1e02.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_23a2f48658354ee789f499b9ed9c29b1.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_10e20f96eeff48d9ad46608401b9d8f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d96b45-ed55-4d7b-b69a-d459044e26ae/how_to_pair_alpine_stereo_bluetooth.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_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 5136 bytes
SHA-256: bf9ee8f4284b8754138e7c7147e81be02e0d1b002a55b34e095b72b2ac1f405e
font_01_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 11280 bytes
SHA-256: c61cbd9bfd3d1f33e801046e1f55b71ca18d7593e735c58260c6486bff849b7e

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