PDF malware analysis — malicious · 3871644668fd583a

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 22:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: f8f776c34dde2c433b3b10e810047731 SHA-1: 0019ba0852363948288a20ab131b638d733769c7 SHA-256: 3871644668fd583ab17ae423faa7b718fab9f86a66facbd2e036fd1694341b7b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. Embedded JavaScript streams and numerous external URIs suggest an attempt to redirect the user to malicious content or download further stages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure by indicating a link farm on disposable hosting.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 6

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.
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://galantemontagnana.it/ckfinder/userfiles/files/zipopadekizavava.pdf In PDF document text
- http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614b687b16bf1---visigixegoguzive.pdfIn PDF document text
- http://matrixpaint.com/ckfinder/userfiles/files/62705259015.pdfIn PDF document text
- http://zaiger.ru/img/file/zemavajakogis.pdfIn PDF document text
- http://moriefrusca.com/userfiles/files/lazomufeziresozojivutad.pdfIn PDF document text
- http://i-p-p-c.com/ckfinder/userfiles/files/48367863234.pdfIn PDF document text
- https://toolsatool.com/userfiles/files/pigunex.pdfIn PDF document text
- https://ptkas.com/kingkong/userfiles/files/kibafujudus.pdfIn PDF document text
- http://www.sictombbi.fr/ckfinder/userfiles/files/rokijetisuxufeletunus.pdfIn PDF document text
- http://bertrandetgastineaudesigners.fr/userfiles/file/22201937532.pdfIn PDF document text
- http://massimosusto.eu/userfiles/files/lumojugamenufevumobu.pdfIn PDF document text
- http://mitroc.com/userfiles/file/56391942575.pdfIn PDF document text
- http://veszpremlizards.hu/_user/file/32597326268.pdfIn PDF document text
- http://www.derbysignandgraphics.com/uploads/file/21372746674.pdfIn PDF document text
- http://1137.jp/app/webroot/js/ckfinder/userfiles/files/rewat.pdfIn PDF document text
- http://medical-1669.com/userfiles/files/54035576533.pdfIn PDF document text
- https://pharmawell.eu/ckfinder/userfiles/files/63795532202.pdfIn PDF document text
- http://brickchamber.com/ckfinder/userfiles/files/95832708069.pdfIn PDF document text
- https://fq.ua/images/file/nixiduda.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/e8ba29otd22ncl8ga6d04o3hf4/90446910984.pdfIn PDF document text
- http://vatlieulamnha.com/media/ftp/file/11899944984.pdfIn PDF document text
- https://profix.fr/ckfinder/userfiles/files/fimiwivenuzowubotiladed.pdfIn PDF document text
- http://fosterfreezesantarosa.com/uploads/files/bigujo.pdfIn PDF document text
- https://oncetrabzon.com/resimler/files/93532731857.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=asterix+in+latin+pdfPDF 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_off0000b39e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB39E	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000cbb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCBB0	17100 bytes
SHA-256: `4633cb82c1fb522cd5f2fa00d0e59ca1f375faa1e7af6cd8d35f025f25c9398d`
`font_02_sfnt_off0000f6d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6D4	10452 bytes
SHA-256: `ea80d48bb06992bcc07dafb30f84dc09cf1aa80b7fa255dff33283998528494c`

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