PDF malware analysis — malicious · b501f8e5abc02cda

MALICIOUS

PDF

74.1 KB Created: 2021-09-15 07:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: cf806d887e77c8d0daa418e842bae32c SHA-1: 4618648ac0453498b7c01c648ea8289e45a094a2 SHA-256: b501f8e5abc02cda54f1cb4334910520538fe09395afb1f3fec765cbe56f5ca2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs that redirect to other PDF files, suggesting a link farm designed to obscure the ultimate malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download content.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://queure.ru/uplcv?utm_term=john+wick+yify PDF link annotation
- http://sensitiva.fi/UserFiles/File/76098324346.pdfIn PDF document text
- https://willmarareachamber.com/ckfinder/userfiles/files/7587202598.pdfIn PDF document text
- http://tottazo.com/userfiles/file/55412705265.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161414ca09d458---nesedofiritufakudebinapa.pdfIn PDF document text
- http://www.pzkexie.com/up_files/file/lanimupevidowujipenides.pdfIn PDF document text
- http://abwrva.com/uploads/files/1526551547.pdfIn PDF document text
- http://sportingfoundation.com/uploads/file/nafazabebusozunakoga.pdfIn PDF document text
- http://diysmart.net/userfiles/file/16830389.pdfIn PDF document text
- https://kurishupally.org/userfiles/file/99766740448.pdfIn PDF document text
- http://enjoybowlramenandpoke.com/uploads/files/45854895625.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/94279165358.pdfIn PDF document text
- http://srtprogetti.eu/userfiles/files/34176727790.pdfIn PDF document text
- http://klm-co.ru/foto/ck/files/10420424335.pdfIn PDF document text
- https://jensbrode.de/files/file/kepuvodusavatufitikin.pdfIn PDF document text
- http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161416498c35d9---59003006065.pdfIn PDF document text
- http://www.rify.us/cms-uploads/files/13662471689.pdfIn PDF document text
- https://manualismedicina.hu/fileok/file/wasivuletosow.pdfIn PDF document text
- http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/jebosejuxavuvelabobigi.pdfIn PDF document text
- http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f76c6c9e88---79284529009.pdfIn PDF document text
- http://motolargo.pl/userfiles/file/94934010096.pdfIn PDF document text
- http://beverly.kopanramen.com/uploads/files/54606938259.pdfIn PDF document text
- http://valdhans.cz/userfiles/file/30461722665.pdfIn PDF document text
- https://maintogelonline2.org/contents/files/88078555418.pdfIn PDF document text
- 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_off0000bd76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBD76	18064 bytes
SHA-256: `6e7dca63db248fc9e4bdf6b65ba8bce4101956a6bd1ae0a6fe7005e5d38c7c39`
`font_01_sfnt_off0000ecc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECC5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000104dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104DC	10012 bytes
SHA-256: `214fbe8a9ef0bc343f664dc1671e2b36a284aaa0df8cfb873e2ca96d2bcffc97`

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