Malicious PDF — malware analysis report

Static analysis result for SHA-256 58aa04c1de77da2e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-13 12:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9348a473e4ca82532c77bf9d6bb85360 SHA-1: 540460cb2293cf603c72ab2fb168dcf714baffdd SHA-256: 58aa04c1de77da2e835d8996da5f570d66a17fa4f3ad729a6d42f45fbe8b4ebd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of these links, which are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://debnine.net/UserFiles/File/16077582185.pdf In PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/nelivemuxanoginebali.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210909161950.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/fekowew.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/78310708103.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/pakemi.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/fobevukaw.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/fawabiralopij.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/38850926750.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/84901252795.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/76303876129.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/44477595857.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/zepomajese.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/fuloxagud.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/96042171638.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/govudimovavonisodiwujorel.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/28076451146.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613044b66bcf0---wetedoweta.pdfIn PDF document text
    • https://digireg.ch/upload/gujivaril.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/57749256531.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/91324843796.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/78704834970.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/rikalufovobegejigowiwafib.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/15014684563.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/lugutegerekuvosiwozuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=king+of+crabs+hack+apkPDF link annotation
    • 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://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_off0000b1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F5 15192 bytes
SHA-256: 77a03140b6f4cb6e877796fafee5895323d92da2582270d462bddeef06737a55
font_01_sfnt_off0000d7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E6 10708 bytes
SHA-256: 713f954916ee69008f593eb5e9e8d07d491588b96d8ba850838580231715e1aa
font_02_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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