Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf1ae779b6f629c…

MALICIOUS

PDF

75.6 KB Created: 2021-02-17 13:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 817ac38fd7a43095fa34a0de92627df9 SHA-1: 23231b36bb9c49fe0f242a89d07c41a32359c21f SHA-256: 2cf1ae779b6f629cd7b6bd531c60aee6c4bf5c2c2b59db617d5d6b403d60b793
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, appears to be a lure related to weight gain plans, suggesting a phishing or scam attempt. The presence of multiple disposable hosting links further supports a malicious intent to distribute malware or phish for information.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=how+to+gain+weight+eating+plan In PDF document text
    • https://cdn.sqhk.co/kowaziwaso/ehdyv49/1019486143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5fd7c3a609000.pdfIn PDF document text
    • https://cdn.sqhk.co/sabimejuka/jagepUK/30978714157.pdfIn PDF document text
    • http://giboxibefelas.22web.org/comcast_tv_guide_app.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/gFibwih/train_to_gensan_unlimited_money_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/fKGbhcP/femaxoweli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5fddaf342c28f.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gfijJ9s/stickers_de_youtube_par_whatsapp_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/DWlghid/mipanitarafosemofafisipak.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/ic5jbgf/wijewipeku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitugoxopezuwu.rf.gd/67701189502.pdfIn PDF document text
    • http://tufifexafepo.epizy.com/arduino_ide_windows_10_free.pdfIn PDF document text
    • http://jizabimumonox.rf.gd/official_scrabble_cheat_sheet.pdfIn PDF document text
    • http://papawipowujujed.rf.gd/inventory_management_excel_template_free.pdfIn PDF document text
    • http://residarifuwus.rf.gd/nrega_job_card_full_form.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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 4860 bytes
SHA-256: ba36cb98ea0a940768d95406454018335a7e52af41333dd036ae66447e14ccb2
font_01_sfnt_off0000fded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 10372 bytes
SHA-256: c693ae2a470b12990bb0ac6b651f8accbf5c590eaf792c2c996cca18e934f0dd

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