Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6c370838dba5bb…

MALICIOUS

PDF

69.8 KB Created: 2021-02-21 16:52:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a15a74ef1486af163a0025d78ea57c0d SHA-1: 384995e6fbb6c4042cfac0996e7fd419b3136ed8 SHA-256: 2e6c370838dba5bb21b71b6c9730c8d65f3f617105c3988b4817886c0e1d61fb
136 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a redirector link, identified as a lure for free downloads and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL, https://bologen.ru/123?utm_term=how+to+setup+logitech+z506+speakers+to+pc, is the primary indicator of this phishing attempt.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/123?utm_term=how+to+setup+logitech+z506+speakers+to+pc PDF link annotation
    • http://pixelbarista.com/kimuwigigivikananugagosudeoyga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413368/normal_601cbc42c5180.pdfIn PDF document text
    • http://pixell.store/livery_bimasena_sdd_pnglg2fm.pdfIn PDF document text
    • http://atomlinux.com/pearson_geometry_textbook_answers_page_153bkb6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_6025c23fe88b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_601f88e11e519.pdfIn PDF document text
    • http://fastnoutservice.ru/1965_john_deere_110_parts4va65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489716/normal_600921dd17860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5fe17bff5c965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jimugivos/freeze_panes_in_excel_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/nedapobapexuseke.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/jowokaderapazibewefet.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/lenovo_thinkpad_e580_spec_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/7158634347.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/servicio_de_alimentos_y_bebidas_concepto.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/58585617204.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/inner_child_guided_meditation.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/ejercicios_caida_libre_1_bachillerato.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_off0000d1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 5784 bytes
SHA-256: ba8ccf85cab53217fee242ad26213f73d55d62e2e3b68344b3f555156751815e
font_01_sfnt_off0000e597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE597 10632 bytes
SHA-256: ce3a10f2bc66fe06b83f0439ec933db599f5e3963d27f435cd0e75a3abae0d33