Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddef8e8be1533d5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 00:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55302d58374dcbe0d60074cac48493a1 SHA-1: 87152ac7ab49af564a76e975cbcdd06340ebb083 SHA-256: 7ddef8e8be1533d58c1b12f48bb88f9242881ed14af1fcdcc6f49a64cd261168
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://uppersanduskyrotary.com/cms/files/File/xafawuzusexipofi.pdf In PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/sixugiramatudeguwunas.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/14759788801.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/55768851563.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/murarozejakiwo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/93629697550.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/riwaxexefudifixa.pdfIn PDF document text
    • http://mfcpavpos.ru/file/60933743458.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135145928e5e---54360059462.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131708e6b6e7---93700301392.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/14731447835.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/38273444231.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///29949432374.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/zokotugukufas.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/74050676499.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210916163182787839.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/xolezewus.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/godakawomevo.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/91119303830.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/69269428479.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/22526366956.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/pajagopinakivovexuf.pdfIn PDF document text
    • http://e-menu.hu/editor_up/71798301720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=snapchat+crashing+androidPDF 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_off0000d7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E8 17960 bytes
SHA-256: 8519e902c87d23c895ee866943dc89c1cfec2bec74b2cc21e5e93e52f572fe44
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 10688 bytes
SHA-256: b4420d3a8a5df844ff429519cac8f1bfe6554cdad0bff6b2c620d73d098c61e9
font_02_sfnt_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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