Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9f43feebb4116b…

MALICIOUS

PDF

75.6 KB Created: 2021-05-10 04:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9b6307c32aa38e0318fe7849640a5c3a SHA-1: 73c94ce586ceb1fc15f5251e13b275ed9ec9f799 SHA-256: 7c9f43feebb4116b5d2a8ef146991f5ecb03fe743ce3aaa99d0375f371214ac5
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term, reinforcing the idea of a lure to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://zajinet.ru/strik?utm_term=lego+harry+potter+year+6+full+movie PDF link annotation
    • https://fevadejo.weebly.com/uploads/1/3/0/8/130814338/2c891.pdfIn PDF document text
    • http://ronerikasov.22web.org/couchsurfing_in_iran.pdfIn PDF document text
    • https://tanatomunedasov.weebly.com/uploads/1/3/5/3/135325499/sorutoratidakopuxu.pdfIn PDF document text
    • https://tagopudul.weebly.com/uploads/1/3/5/3/135392217/2c527e0023a70d.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/51977386725.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/e68ac593f0ceb.pdfIn PDF document text
    • http://niverokime.iblogger.org/mysql_for_beginners_book.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/46796179281.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/78023418418.pdfIn PDF document text
    • http://xobuxok.22web.org/salifatemunowizajamufiru.pdfIn PDF document text
    • https://dowusezawidi.weebly.com/uploads/1/3/3/9/133997386/9125cc41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fatowulur.epizy.com/pneumatic_valves_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/the_lying_game_book_2.pdfIn PDF document text
    • http://tutivute.epizy.com/rsmssb_answer_key_lab_assistant_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/clarity_on_vsco_android.pdfIn PDF document text
    • http://sadedegigagivaw.rf.gd/85236771907.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/5044624381.pdfIn PDF document text
    • http://mojigoka.atwebpages.com/suzaxazixezisowere.pdfIn PDF document text
    • http://xorirefojexo.rf.gd/33401872371.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/tascam_dr-22wl_manual_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/cafe_racer_mod_apk_ios.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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 5392 bytes
SHA-256: 45cbc9328618339a0ec509e5807060b01f47e0078ff0e227ae3b00080fc5bf02
font_01_sfnt_off0000fb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB91 11108 bytes
SHA-256: d9fd59079559e6edaf3b295142738edda19f032046fb0c994b963eaaafb04d3a

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