Malicious PDF — malware analysis report

Static analysis result for SHA-256 756e9800603886f8…

MALICIOUS

PDF

72.0 KB Created: 2021-09-09 02:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 87274cd5251746b6ff7ccaf436e4af06 SHA-1: 8ed3e67c6c215c7146bb065cabaafcd0f3d80933 SHA-256: 756e9800603886f87901e184cb7cd4537b5a4cbe3de3e06271caad50b96825c3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://houstontca.org/Content/uploads/files/80145972056.pdf In PDF document text
    • http://astprom.ru/sites/default/files/file/figumasavuboz.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/30852294773.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/21512108128.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/wogubupelaf.pdfIn PDF document text
    • http://esistore.be/userfiles/file/28829680815.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/memuv.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/tigaxowobevixitovidalegan.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/22845f60dcab2253fe8d60c5fda3b964/83947581223.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/23463465852.pdfIn PDF document text
    • https://biomisszio.hu/tmp/40987188797.pdfIn PDF document text
    • http://all-premium.com/user_file/files/62110844466.pdfIn PDF document text
    • http://koddous.com/userfiles/file/fopuwaninuxatesosunar.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/23943369845.pdfIn PDF document text
    • http://halmar.info/userfiles/file/6424883408.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161310308ccd89---bavuguzizodadu.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/gitebedewuk.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/soronenimiwinusik.pdfIn PDF document text
    • http://skupka23.ru/upload/m/71310455254.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/wajilonevezen.pdfIn PDF document text
    • http://m2m2design.com/userfiles/15148039692.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/numofaroponakerepadinifod.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/tulegeraluludisaromiba.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/mosaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=shellshock+live+unblockedPDF 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_off0000ba1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1D 15736 bytes
SHA-256: 3c0d2536e8f34acc5159a354eb4df167c7b1893e6f4ff4eadec2fa8b0a7af927
font_01_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 10580 bytes
SHA-256: 41298c23b21a36d3a44f9dbdd8860608e756286c2c5a1ae10676eb604e3fc724
font_02_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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