Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdf6962738c3695…

MALICIOUS

PDF

69.4 KB Created: 2021-10-04 07:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 597053555ce3b3b131de95754236bd3f SHA-1: 8b32ed676713289f736d49fe81a703dac0a1d3ce SHA-256: 5bdf6962738c36959f7f32e549cb780b7cc7f0b00f8cd53b3dbba00d313ed9ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external domains, suggesting it functions as a lure to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a strategy to distribute links across various disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://otoform.com/upload/ckfinder/files/kawonugeridusivedolab.pdf In PDF document text
    • https://5uempat.com/contents/files/12511063124.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/webobiguga.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/51007972388.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/midagevamijewufijomuv.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f1b5b56ebd---5743586661.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164d66c7a7---49022197783.pdfIn PDF document text
    • https://31app.com/userfiles/file/voseketawonoruzekofovus.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/vudetofel.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/53237689044.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-22/20210922145529690153.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/bipojaj.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/kevulabufoj.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kokenizukomawugijikofil.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/95485897648.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/bakemugemo.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/75706884595.pdfIn PDF document text
    • http://eur-idea.com/userfiles/file/46630480761.pdfIn PDF document text
    • http://strap.sk/uploads/file/fefomufeleleb.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/52528425648.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/10743411463.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/sojewudetabasetiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=black+panther+font+stylePDF 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_off0000b146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 15136 bytes
SHA-256: 26ccbfa5589422b54e62773e6a508a9a82a5fc1426fb7dc30139ca2ceb14061f
font_01_sfnt_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 10744 bytes
SHA-256: 2a1e256b050f8bee74a4cc7066afb660439173b682358dab40f602d5d2a7a9c1
font_02_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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