PDF malware analysis — malicious · 50253028d13802e5

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 09:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 868a3eeecfb85c9891b015c4d396473d SHA-1: 5cab530cedeedb16d91412c2bd3ab877122b9308 SHA-256: 50253028d13802e5cd53a0382e5c72255e47a3809f5f8996297661ba34ccf3a7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, indicating it is likely a phishing lure or a downloader for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, further supporting a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=element+app+android PDF link annotation
- http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27775246310.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/vupalasiwiluk.pdfIn PDF document text
- http://hide-bo.com/img/tmp/file/17592544494.pdfIn PDF document text
- https://jatransfer.com/userfiles/file/88432462221.pdfIn PDF document text
- https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/st0rk3657q1lc568duv4olengs/81652489166.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/297b1000f8d4e3c886720c3ccaa844f3/sofobad.pdfIn PDF document text
- http://euro-ex.net/images/blog/file/rivesaxomasasit.pdfIn PDF document text
- http://tamtamphat.com/upload/files/77345516991.pdfIn PDF document text
- https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/54394284128.pdfIn PDF document text
- http://scuolascifondocortinadolomiti.it/userfiles/files/59701341313.pdfIn PDF document text
- http://enjoybowlramenandpoke.com/uploads/files/32779922317.pdfIn PDF document text
- http://ronaldtan.nl/images/photo/govinalegagofu.pdfIn PDF document text
- http://ahkkpcm.org/userfiles/66878291713.pdfIn PDF document text
- https://vinniescustoms.com/userfiles/files/jemabagifalexesoja.pdfIn PDF document text
- http://domosplast.hu/files/file/fakodali.pdfIn PDF document text
- https://bvphcn.bdata.vn/upload/files/23310570840.pdfIn PDF document text
- https://martan.es/cenavarra_userfiles/files/losatatimijojosu.pdfIn PDF document text
- http://e-photo.lv/ckfinder/userfiles/files/66792728695.pdfIn PDF document text
- https://giant-nano.com/app/webroot/userfiles/files/73641031489.pdfIn PDF document text
- http://www.peritaonline.es/ckfinder/userfiles/files/92831151142.pdfIn PDF document text
- http://ttmplus.com/userfiles/files/82492908212.pdfIn PDF document text
- http://kepco-group.com/uploaded_files/userfiles/files/gozoresawanogo.pdfIn PDF document text
- http://garagehayashi.com/js/upload/files/60625535183.pdfIn PDF document text
- http://cyclad.org/UserFiles/file/xajijufidewup.pdfIn PDF document text
- https://listocrm.com/userfiles/files/vuwakidep.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_off0000eb8f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB8F	17392 bytes
SHA-256: `a82099d56842442bc24d05d71e7fe2785d57b97fb7dbcd391bd3e45ca22d9372`
`font_01_sfnt_off00011859.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11859	10368 bytes
SHA-256: `7dd9127ae018aa32be1a2c8f445537644d418cdfd72f8c387aa07fd897e335d1`
`font_02_sfnt_off00012fa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FA3	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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