Malicious PDF — malware analysis report

Static analysis result for SHA-256 9928bef84b7737f2…

MALICIOUS

PDF

76.4 KB Created: 2021-04-08 14:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 715911bf94a12b8f5ced9d2bf70b2735 SHA-1: 535aeabe2082ff87332e79e11fc01429fe2357e5 SHA-256: 9928bef84b7737f2ebe52674b3da5353471b63d4c732a45981c706348a5d6485
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://golowaki.ru/strik?utm_term=what+are+the+national+physical+education+standards PDF link annotation
    • https://zefemebok.weebly.com/uploads/1/3/0/7/130775969/kapifebonemupago.pdfIn PDF document text
    • https://moramiwise.weebly.com/uploads/1/3/4/7/134736235/lalow.pdfIn PDF document text
    • https://debexubomes.weebly.com/uploads/1/3/4/8/134881130/8655762.pdfIn PDF document text
    • http://rte-ita.fun/maguboporamosagv86u.pdfIn PDF document text
    • http://igclienteam.com/db_power_ip_camera_software_download9gurz.pdfIn PDF document text
    • http://retenenu.iblogger.org/mugafovevitokenaw.pdfIn PDF document text
    • http://malespw.xyz/5m_bell_tent_footprint_groundsheetmobvx.pdfIn PDF document text
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/2134453.pdfIn PDF document text
    • https://mizugoveram.weebly.com/uploads/1/3/3/9/133986338/8203241.pdfIn PDF document text
    • https://sojutobifedurex.weebly.com/uploads/1/3/4/5/134588439/najeletat.pdfIn PDF document text
    • http://cmbclientes.com/discounted_cash_flow_excel_spreadsheethzhvp.pdfIn PDF document text
    • http://xekilekugud.iblogger.org/grammar_worksheets_for_10th_grade.pdfIn PDF document text
    • http://gsmall.space/vufazirufexajudiluredepvlv2v.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/daxemo/tevazoxiregafesunote.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/26416421558.pdfIn PDF document text
    • http://garulolit.rf.gd/76230514331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4776a76-0ab9-4688-9516-cbafe2c7af21/51627460279.pdfIn PDF document text
    • http://gusipeviriw.rf.gd/uma_chakravarti_brahmanical_patriarchy.pdfIn PDF document text
    • http://duwujedop.rf.gd/why_are_my_legs_red_and_bumps_after_shaving.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80fad46e-a9b6-45eb-9385-54a792ad4984/96759480456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7d0318-d563-46a4-bcd0-416c92a528d1/tifunejexabagigadak.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/poster_mockup_psd_template_free.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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5276 bytes
SHA-256: ea025b985247943b30d6aa56c0acfd9274b76b98356093dcf80750754a8d76e8
font_01_sfnt_off0000fe75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 11016 bytes
SHA-256: 6472f733289ee2c461b6686cfdfeec45c423ea6b3e1364daa6c5c95a00e0863b

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