Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a27b5455a4ef75…

MALICIOUS

PDF

77.0 KB Created: 2021-03-19 11:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f98e31fc939d3b76c674cb3198ffb78f SHA-1: d1b8804ba24b349d2be6884835ff3dbd7a411612 SHA-256: c2a27b5455a4ef7582d07ceeefcf0d22670739fc46bcd40ea76ed13100bed4a7
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with one prominent link pointing to 'https://midufefew.ru/award?keyword=self+certification+form+2020+pdf', suggesting a phishing lure. The document body, though heavily obfuscated, appears to be related to a 'self certification form 2020 pdf', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=self+certification+form+2020+pdf
    • http://design-kvartira.info/lomukewenurulojecl3pw.pdf
    • http://fosipuzo.mypressonline.com/rh_isoimmunization.pdf
    • http://gadatoreneperil.mygamesonline.org/aptitude_test_for_entrance_exam.pdf
    • http://ig-copyrighthelpcenter.com/64313109884fd8vd.pdf
    • https://cdn.sqhk.co/wesebewoweva/ogeggkY/kokatedijadelo.pdf
    • https://cdn.sqhk.co/mevexobuzur/7LiaCPu/36057801519.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/novipaliwid/63042817083.pdf
    • https://uploads.strikinglycdn.com/files/0e5f2b1b-5b48-4ee5-8eb3-f6c39b4d74e6/nuturit.pdf
    • https://s3.amazonaws.com/nagev/89119602431.pdf
    • https://uploads.strikinglycdn.com/files/0f417ea2-e390-4dd9-ad35-ab12e26511da/can_you_put_a_tracfone_sim_card_in_a_cricket_phone.pdf
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_0ca6fd982e334d67a1335dc372ad97a7.pdf?index=true
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_4ce38b2b219547fe9cb597485ba44a40.pdf?index=true
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_5056c08333294414852396f180abf47b.pdf?index=true
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_0d5650f958c940f4ac19f822d10449de.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6e4c584-a21c-46a5-933f-5a1baa1d05c2/shivprasad_koirala_7th_edition_free_download.pdf
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_423cba4d8c8343caa5cc779a02d8f4a5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a1d8140b-01bd-462b-8e82-57bf40c36ca1/nosite.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecdb.bin
b2d6067695c89bced36fe40a866c1a013ac03015a96380484676dc6dd8bd88e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 5500 bytes
font_01_sfnt_off0000ff7d.bin
4691266dd4439da5a6f5f6e07d65259985cbe70fb0a6adb67784a89d4ab81853		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 11108 bytes

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