Malicious PDF — malware analysis report

Static analysis result for SHA-256 3358aed70034e00e…

MALICIOUS

PDF

78.9 KB Created: 2021-02-25 17:35:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0d9311dcbf0da5fd58727a8de32d61fc SHA-1: f476bea162d0de6e699de1f8c237ac1ad649303f SHA-256: 3358aed70034e00e947ea6c72f2d1c0406b949ce2f59338314662e8a1a4847c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is a link farm hosted on disposable domains, pointing towards phishing or malware distribution. Numerous external URLs are embedded within the document, likely serving as the primary attack vector.

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://jacksth.ru/123?utm_term=how+to+train+for+football+alone PDF link annotation
    • http://coins24h.com/22292460746xzir2.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/4Ljdpjd/the_bucket_list_movie_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5fc5a30319717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_6009d30d72299.pdfIn PDF document text
    • http://hiziryigit.online/5894489266375dg6.pdfIn PDF document text
    • http://golomashvanna.xyz/financial_mathematics_noteso53e2.pdfIn PDF document text
    • https://sivabukejiwija.weebly.com/uploads/1/3/4/4/134459056/sofef_wosipipaged_wazesijured.pdfIn PDF document text
    • https://jadusulad.weebly.com/uploads/1/3/4/7/134764450/sebuweku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_6025118b75962.pdfIn PDF document text
    • http://hopecommunitynaz.com/geteppf671.pdfIn PDF document text
    • http://raifaisentapp.online/aprende_hangul_el_alfabeto_coreanooqpan.pdfIn PDF document text
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/vafixup_karifojegebefu_wivevuwo.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/be11da.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/86195208383.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/bWVBrja/flat_pack_tiny_house_usa.pdfIn PDF document text
    • https://bigififipajug.weebly.com/uploads/1/3/4/7/134709095/fawuri.pdfIn PDF document text
    • http://soul-felt.com/american_athletic_conference_basketball_tournament_201902utl.pdfIn PDF document text
    • http://baykamif.space/vexadotuberosuridadamaxoko6u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/dewalt_3000_psi_pressure_washer_for_sale.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_off0000f7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DE 4776 bytes
SHA-256: 68be64675fd17482956f12337c312276554673f3f16b98fa2e417a288d3f4b9f
font_01_sfnt_off0001083f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083F 11072 bytes
SHA-256: ee8788c8e0a3a639dac5b1b86ac9b16a3973518a51d25eb81218592989c21680

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