Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93685d8f34baf88…

MALICIOUS

PDF

70.7 KB Created: 2021-03-01 06:05:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 33c553f095982e4ccee65d2437796e01 SHA-1: 7098e7e1dfd6eb40bb39c95338ef2de2c2d0490a SHA-256: c93685d8f34baf88811975629022192cf2cd26511932c1591e2edc539fdc8720
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host links, likely for distributing malware or phishing content. The primary IOC is the external URI pointing to 'soxebez.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=brother+hl-2270dw+paper+tray PDF link annotation
    • http://ibkreactiva2020.com/tesco_dishwasher_rinse_aid_data_sheetdf0b5.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/euro_pro_x_sewing_machine_tutorial.pdfIn PDF document text
    • http://rankingcoach-seo.com/dinigusokidikaxuruxamt8hg.pdfIn PDF document text
    • http://apelsins.space/associate_android_developer_exam_syllabus7ed3m.pdfIn PDF document text
    • https://meligobuv.weebly.com/uploads/1/3/1/0/131070858/gitiwolumerimugi.pdfIn PDF document text
    • http://kleomaften.online/muleninovilexuposl42im.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/66910250254.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/55226202871.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judewal.rf.gd/99972298683.pdfIn PDF document text
    • http://newemepakirid.myartsonline.com/weroli.pdfIn PDF document text
    • http://voduvurikijo.rf.gd/what_does_the_word_logic_mean_in_science.pdfIn PDF document text
    • http://puzujudu.rf.gd/68390037966.pdfIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/15305805763.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_off0000d53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53C 5500 bytes
SHA-256: fd9c2a88999c6632ecc0db55b9ba9229cf74581f025a91d30922aef60f5561d8
font_01_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 11136 bytes
SHA-256: daf4d3698bd33807349c98e3daf7db424debe2d7b3455a9a9df7cb12e6eaa282

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