PDF malware analysis — malicious · 72e6676065204b1a

MALICIOUS

PDF

72.0 KB Created: 2021-09-12 20:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 914368c566e59c3c0a77be4d437c0f8f SHA-1: 0b41d79381830052dfe1fb8e465c5b12520b2236 SHA-256: 72e6676065204b1aa645ba288bab96721b5bd65a8ab4c7320b509ed2ce5d9b4b

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for multiple links. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggests it's designed to lead users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

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://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/zutelutigugitu.pdf In PDF document text
- https://intersensor.ro/v2011/Files/fck_upload/file/70576987028.pdfIn PDF document text
- https://mariapolis.es/ckfinder/userfiles/files/wuzowuxe.pdfIn PDF document text
- https://szallas-karpatalja.net/upload/71825390963.pdfIn PDF document text
- https://rimi.sk/userfiles/file/vomegepikosojetoxewedegez.pdfIn PDF document text
- http://istihdamhaberleri.com/upload/ckfinder/files/fedamowowe.pdfIn PDF document text
- http://controldellaves.com/app/webroot/arxius/file/35243200226.pdfIn PDF document text
- http://tsrmvolontari.it/userfiles/files/rorarezedejibije.pdfIn PDF document text
- http://daearesort.com/FileData/ckfinder/files/20210902_8481E03C98C53243.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d467860ee4499ff72ac2ea7505272a10/80967012983.pdfIn PDF document text
- http://vngo-cc.vn/cooker/public/files/57635883625.pdfIn PDF document text
- http://otvorene-srdce.sk/userfiles/file/81582328741.pdfIn PDF document text
- http://centreforeffectivecoaching.com/media/file/bumefi.pdfIn PDF document text
- https://bya-ingenieria.com/ckfinder/userfiles/files/jezamababuvagapumusod.pdfIn PDF document text
- http://sellmysayarah.com/userfiles/files/11568612589.pdfIn PDF document text
- http://elskenecologie.nl/files/wadizokojaseka.pdfIn PDF document text
- http://suliaox.com/v15/Upload/file/2021910185652246.pdfIn PDF document text
- http://atsrealtyvietnam.com/upload/files/1490642023.pdfIn PDF document text
- https://hotlinepro.in/admin/userfiles/file/80741049529.pdfIn PDF document text
- http://qlionshousing.ca/userfiles/file/sapoxil.pdfIn PDF document text
- https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/chdefl1ap07ofk26u4uln07l40/21329362824.pdfIn PDF document text
- https://suativisamsungtaihanoi.net/upload/files/92996225260.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rate+of+change+from+tablePDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b8b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB8B4	16152 bytes
SHA-256: `be0a8b2453d9e75559dc8e1a1bf646d9479c79e6c05615cfd1ecf83a57031175`
`font_01_sfnt_off0000e235.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE235	10708 bytes
SHA-256: `c815bc9f9bc425618c4957da2fd77a2d101a8d05c53c8269e3b8c73b735ce466`
`font_02_sfnt_off0000faa0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAA0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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