Malicious PDF — malware analysis report

Static analysis result for SHA-256 263fefed4323dd69…

MALICIOUS

PDF

72.4 KB Created: 2021-02-01 23:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2b7f6a2a796217ae10175e863f052905 SHA-1: ef8d789cdcff5f50f09c6cb299a7deda0a811039 SHA-256: 263fefed4323dd69e92fadaa32c9763648067dc9f8b49bfa3029076208baa5ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with one specifically appearing as a search result for "Photoshop selection tools" leading to a suspicious domain. ClamAV and an ML classifier flagged this PDF as malicious, indicating a phishing or malware delivery attempt. The presence of numerous links and disposable hosting suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=photoshop+selection+tools PDF link annotation
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/dibipebosuwun_sabixexuferudej_vizemibewig.pdfIn PDF document text
    • http://help-service-support.com/digicel_sales_applicationsafnhp.pdfIn PDF document text
    • http://epipog.com/belesm2z19.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/3886464.pdfIn PDF document text
    • http://mivetys.xyz/mogovawukanixivabanowgwuao.pdfIn PDF document text
    • http://cherrypimp.online/50277685178tsr89.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dilabopitomosif.epizy.com/37076991811.pdfIn PDF document text
    • http://newubopuga.epizy.com/75108979034.pdfIn PDF document text
    • http://jerananixakuzeb.epizy.com/60493817616.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/connected_no_internet_android_9.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/pevupolidosalinujo.pdfIn PDF document text
    • http://kujujigufa.epizy.com/despacito_line_dance_step_sheet.pdfIn PDF document text
    • http://jufazireti.rf.gd/gray_blue_bed_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/mebom.pdfIn PDF document text
    • http://zurabogefu.rf.gd/zupawifixazenemeku.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/22857443733.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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 4716 bytes
SHA-256: 06a5c12fd17c87a8d2466740ac9b25ded91d4fd703b7d1118282d8418ca0c44b
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 10760 bytes
SHA-256: 98029edd2b5471ab5964b17b6f707e30745ca322dfc9b5ddad226ea9e4019cc4

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