Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3d38b3200bc748…

MALICIOUS

PDF

76.7 KB Created: 2021-02-21 13:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85822512455aac4aec5ddfa69d0aa676 SHA-1: a71b008c87fcdfe47007f3d59d12f154d5c89cb8 SHA-256: 4b3d38b3200bc74882bdf3faadc17fbf796c9811f988e83087722dc993952b34
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or personal web hosting platforms, suggesting a link farm or phishing lure. The heuristic PDF_SEO_LINK_FARM firing indicates a mass of external links, and the ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION firings confirm its malicious nature. The document body, though heavily obfuscated, appears to be related to exam questions, a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://baarspo.ru/wix?keyword=ccna+wireless+200-355+exam+questions+pdf PDF link annotation
    • https://nobexuliga.weebly.com/uploads/1/3/1/4/131405940/786710.pdfIn PDF document text
    • https://dexidete.weebly.com/uploads/1/3/5/3/135394420/7481392.pdfIn PDF document text
    • http://1green.space/aptoide_apk_download_minecraft6yro1.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/1PjjIjg/skins_movie_2002_cast.pdfIn PDF document text
    • https://favapebunekef.weebly.com/uploads/1/3/0/8/130874429/57f17cda78.pdfIn PDF document text
    • https://zozolunefa.weebly.com/uploads/1/3/5/3/135325744/mesudame_bumufib_xuxowo.pdfIn PDF document text
    • http://shopeuro.pro/49025749619asazy.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/ifgjihK/68090547281.pdfIn PDF document text
    • http://beautysss.site/vivah_hd_video_movieyl8ae.pdfIn PDF document text
    • https://nejuxudukekiti.weebly.com/uploads/1/3/0/8/130874136/375a7.pdfIn PDF document text
    • http://secret-empire.ru/binary_addition_and_subtraction_examples81h1f.pdfIn PDF document text
    • https://dekajemo.weebly.com/uploads/1/3/1/4/131453049/62442e.pdfIn PDF document text
    • http://webpost.pro/pobewevljmui.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/sizabo/cone_volume_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/accounting_books_philippines_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/baarish_ke_bahane_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/allcast_premium_full_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/notepad_css_formatting.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/punjabi_movies_list.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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 6088 bytes
SHA-256: c3d160e6759d153738684a61f27cb1e6208d2d6db46b05dae9d2a9090266a5ac
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10808 bytes
SHA-256: 2f26feef259e8caf79014f1144d191e4e9267d091fe979b53d34923fe5367354

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