Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3efdc03dc965d75…

MALICIOUS

PDF

69.8 KB Created: 2021-02-13 17:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bc37eaaa1281e7bc3c8e4d7c345d47ba SHA-1: 22dbbcb66ec661fd5ce81e1d01fc99fec87d97db SHA-256: d3efdc03dc965d75caa87f82e484834f6d255aacee2c12bc79040798c336151f
126 Risk Score

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 0.9997

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://druttle.ru/123?utm_term=olympus+camera+repair+parts PDF link annotation
    • https://vefajuvajodal.weebly.com/uploads/1/3/6/0/136094574/gowojuxomar_tonofusotako_feguguxuzag_bizodizudonege.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/ggjchj7/94902342354.pdfIn PDF document text
    • https://tubemugipowiw.weebly.com/uploads/1/3/4/3/134345788/2471570.pdfIn PDF document text
    • https://rababavuve.weebly.com/uploads/1/3/1/8/131871532/kijuvulodimelupotika.pdfIn PDF document text
    • http://bobr.space/72435764547482c8.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/DTUjbAD/51814691532.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/jhbiips/51486937372.pdfIn PDF document text
    • https://cdn.sqhk.co/fimirexuf/idictge/ghost_files_the_face_of_guilt_free_download.pdfIn PDF document text
    • http://moreprodukti.com/real_motos_brasil_dinheiro_infinito_downloadbka25.pdfIn PDF document text
    • https://cdn.sqhk.co/jilowepe/Bjihcie/boris_and_the_dark_survival_free.pdfIn PDF document text
    • http://radanews.site/tucson_cardboard_recycling_pickuprje2x.pdfIn PDF document text
    • http://help-copyrighteamservice.com/dujexefabujosuwopusudotvl9.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/iibhchc/faxobelafaz.pdfIn PDF document text
    • https://cdn.sqhk.co/gisepavuv/gi9hbd2/minecraft_story_mode_cast_ellegaard.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AF 5208 bytes
SHA-256: b8f3161c3e0d6292a0cbc26fc9098f70e128bceb6956e2332a9a790695cf5cf2
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 10976 bytes
SHA-256: 32266a1a8adbc6ff417a7cfcbf5741707c33cf2314117bc4c2ff4852205871b2

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