Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bad7193b1f3c292…

MALICIOUS

PDF

78.3 KB Created: 2021-06-03 12:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6afe4267f811a0fbd2ff45fada959eeb SHA-1: 90aa86424b45e6fd665a4ff3c63b9d82314012f0 SHA-256: 4bad7193b1f3c292e3f51fc131c1de4d313763049a6f36d9eb9bb6da7aecf39a
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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/pbw?utm_term=financial+accounting+in+sap+erp+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4366407/normal_60b740b5c8b46.pdfIn PDF document text
    • https://kevigedevuk.weebly.com/uploads/1/3/1/4/131438682/4590344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444117/normal_5fd2c365d4fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_606dd7349ea9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485705/normal_60081a194e5e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469852/normal_5fca15a157f3f.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/584642.pdfIn PDF document text
    • https://visobugogo.weebly.com/uploads/1/3/4/5/134582963/vumokutexure.pdfIn PDF document text
    • https://takokapaxuv.weebly.com/uploads/1/3/0/9/130968961/milolamemigamexig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_6059858124ffc.pdfIn PDF document text
    • https://rovewavulitomu.weebly.com/uploads/1/3/0/8/130873995/5700672.pdfIn PDF document text
    • https://kitogabizog.weebly.com/uploads/1/3/6/0/136053612/tavusobajofabaxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469116/normal_60045ecf0084a.pdfIn PDF document text
    • https://zajilonuxiwez.weebly.com/uploads/1/3/4/8/134871265/tasukup_wodarejeja_dabujelelefofa.pdfIn PDF document text
    • https://rurirenaw.weebly.com/uploads/1/3/4/6/134652156/wawobejosisakakuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_6013476acabed.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/dugavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dibesusajob.pbworks.com/w/file/fetch/144470859/82803736606.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/f/fenujotirubixupa.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144555747/duworaneg.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/diwijilusi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 5276 bytes
SHA-256: e1a945ef0ed76afed5606e1da068670f8d4d88f1db0339b8faa62171a2aaa33d
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 11412 bytes
SHA-256: a5cd803df636413a43e72ebc7d8dea902100cd8cac2136dfae6bcc1758465b39
font_02_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 16100 bytes
SHA-256: b4d7b5f87a8978f1277a285276ee3d2548d8364787386596eceaf3166abf6284

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