Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c11457e4ee5ca5…

MALICIOUS

PDF

90.0 KB Created: 2021-01-23 00:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 60415052587c6c8c55b2e226df33e243 SHA-1: 96ebcaf5485ab86d92784e2a76d6a8f9a2654775 SHA-256: f9c11457e4ee5ca5d5a950d80af18bc3e837f73e6f07821cc98dfca1f36aa011
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=happy+birthday+funny+status PDF link annotation
    • http://selizixid.iblogger.org/wawowoja.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/ifibs7N/74945941381.pdfIn PDF document text
    • http://vivofuma.66ghz.com/integer_numbers_worksheets.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/taxufusores.pdfIn PDF document text
    • https://site-1178069.mozfiles.com/files/1178069/performing_arts_colleges_in_new_york_city.pdfIn PDF document text
    • https://site-1182802.mozfiles.com/files/1182802/sowuvegidotepigop.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/f7haUgr/77977266547.pdfIn PDF document text
    • https://site-1178505.mozfiles.com/files/1178505/avast_antivirus_2018_for_windows.pdfIn PDF document text
    • https://site-1175399.mozfiles.com/files/1175399/restaurar_backup_whatsapp_iphone_no_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/zvRehbX/superstars_wwe_anime_wallpapers_hd.pdfIn PDF document text
    • https://zasubimivari.weebly.com/uploads/1/3/1/3/131383839/fimedi_pisofoseluz_kipekagexufe.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/TWXOm08/57578269098.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nopatiget.epizy.com/algebraic_fractions_worksheets_grade_9.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/46009997396.pdfIn PDF document text
    • http://fefezaw.rf.gd/greeting_card_template_for_christmas.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 5300 bytes
SHA-256: c56438c5a6c1ccb7aafe53d8a9e13d34a7fbc3162ec4a86caa136bfd92a6ed07
font_01_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 11792 bytes
SHA-256: 8100fb9f40c0f8ea239d5c22fb2107808bd16c7c70679c1bcf27bfa2f6cb5784
font_02_sfnt_off000145d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D3 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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