Malicious PDF — malware analysis report

Static analysis result for SHA-256 1913f6eb49c3c410…

MALICIOUS

PDF

75.0 KB Created: 2021-04-08 01:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: df4dec6f64368b59c2888b56267c3700 SHA-1: 57de24d6a08f3c370384b38ac83ae490e0cd0ab3 SHA-256: 1913f6eb49c3c4105fc4fdd1a95e94539c4c2b5043a09fa12f6e60b59ddcf59a
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 0.9993

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://dafemum.ru/strik?utm_term=how+long+does+it+take+baby+to+fall+into+deep+sleep PDF link annotation
    • https://cdn.sqhk.co/tavolimogid/gi6W0ii/43763759015.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/waselanereganodafar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_60064300b5d29.pdfIn PDF document text
    • http://muxoman.mygamesonline.org/vekenupubofiduzo.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/Cchejji/83923528614.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/ib4Jq7z/rokesonamutubuwax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490133/normal_5fe87ee5d7f79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365525/normal_5fcfa466740d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_6035e14bdd245.pdfIn PDF document text
    • http://risimog.mywebcommunity.org/losasazaburarigupet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_6035b0d1b0a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391302/normal_6011c64c69f2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_b1192c76259b484eb2f913efa24b5740.pdf?index=trueIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_6e316ec4f6814a91b2140819dfdff475.pdf?index=trueIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_70e9500f3a8a406698a644e2354724a2.pdf?index=trueIn PDF document text
    • https://3c1ad7ec-bfc7-452d-a92a-0d22078d3251.filesusr.com/ugd/c6e823_202b43c741394dbd8012e5e72c5a3063.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/what_does_islam_teach_about_jihad.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/dubima.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_3cfe16f4221041909956cbf027eb2f20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/71247316410.pdfIn PDF document text
    • http://najekaweza.onlinewebshop.net/contoh_amdal_perusahaan.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/mad_school_address_karachi.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/probabilidad_y_estadstica_descriptiva.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_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 5472 bytes
SHA-256: 35f96b758ee1afaa77c5d448926f3d5c3a25174d05246711a882b3905647eb78
font_01_sfnt_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 10532 bytes
SHA-256: 022ad186aec3a639430a50bd50f641f611d782d2d74e0ef1a35d20787cb1635c

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