Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20d0b3d9ce279ab…

MALICIOUS

PDF

73.6 KB Created: 2021-03-02 05:44:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f578f2169c0dce16a1247fa3360e22d SHA-1: 9a990004203e666f38dbb77f34d7db933a5d538f SHA-256: a20d0b3d9ce279ab61177a0ac8d733f01b90beed4eb26358b2692bf1dee530f0
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 0.9998

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://resalured.ru/strik?utm_term=fender+hot+rod+deluxe+1x12+extension+cabinet+review PDF link annotation
    • http://mitutepoka.medianewsonline.com/washing_machine_repair_shop_near_me.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/6334386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_603367522aab4.pdfIn PDF document text
    • https://dusadekare.weebly.com/uploads/1/3/5/9/135993409/6353656.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/acer_aspire_e5-573g_battery_replacement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_5fd6c33438ad6.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/que_es_proyecto_de_investigacion_y_cuales_son_sus_pasos.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/73633704547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5fe2a32e77bad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://duwemanuwixam.atwebpages.com/3856049673.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/macromolecules_worksheet_answer_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/costing_sheet_for_woven_garments.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/ac_market_app_new_version_free.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 5524 bytes
SHA-256: 68ed8fdfeae4d5f21dba6acf232ba2128cfba1ba1d3d19a7374955ba4ac496a0
font_01_sfnt_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 8544 bytes
SHA-256: d7c693ce01d4b43e2014ca1a1c953e9da874cc4dc8d33bef6576452b6b76c3ee
font_02_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 11192 bytes
SHA-256: 0b3666cf1c1ed5feba3268361337aa92daed44b9944b64dda16a52c4ae0360e3