PDF malware analysis — malicious · d9c04b1400255c88

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 18:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 20ce7eb1b2af9487c774602726af5058 SHA-1: 447cafb68a4a6a41cdb4fa23fa6c117f1a0ca4ef SHA-256: d9c04b1400255c8801c8da1169dcbc8647a5f2d3dade2ca698e43a2104327618

134 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially malicious or disposable domains, suggesting a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9961

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://cl-metalparts.com/d/files/96689137338.pdf In PDF document text
- https://infosantiere.ro/userfiles/file/44375460377.pdfIn PDF document text
- http://rapet.hu/files/62818990072.pdfIn PDF document text
- https://lacgl.org/upload/editor/file/rogipuriz.pdfIn PDF document text
- http://misterholidaysanprisco.it/userfiles/files/64654166077.pdfIn PDF document text
- https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2a673333---repelavalozegefa.pdfIn PDF document text
- https://stealthwindow.tw/uploads/files/202109071253206182.pdfIn PDF document text
- http://micruts.org/userfiles/file/rovalorepisula.pdfIn PDF document text
- http://xutricolor.com/uploadfile/files/jewekosetuxu.pdfIn PDF document text
- http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/fijugapavuditerusodeg.pdfIn PDF document text
- http://tuzvedo.hu/elemek/file/95175121127.pdfIn PDF document text
- http://ticaproduce.com/ckfinder/userfiles/files/vatuxuxonagavaluzovof.pdfIn PDF document text
- https://rtvpuls.com/ckfinder/userfiles/files/72852544382.pdfIn PDF document text
- http://hcbarrett.com/user_area/file/50647130633.pdfIn PDF document text
- https://orsam.org.tr/paketler/ckfinder/dosyalar/files/bukob.pdfIn PDF document text
- https://adminico.nl/userfiles/file/88019190721.pdfIn PDF document text
- http://www.ciesol.com/ckfinder/userfiles/files/ririlugebit.pdfIn PDF document text
- https://cincia.ro/ckfinder/userfiles/files/67765838726.pdfIn PDF document text
- https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/520015604.pdfIn PDF document text
- http://dongtienlamnghiep.com/upload/file/33954523564.pdfIn PDF document text
- http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16141301f8b144---bapadat.pdfIn PDF document text
- https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/wewupaw.pdfIn PDF document text
- https://demircanticaret.com/userfiles/file/mupotononogupebofeleval.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+sync+samsung+phone+to+ipadPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c7c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7C4	17376 bytes
SHA-256: `acd6e7c68877a08ae75a132fa6246e25a8f44460f30703ad440b582e2004fba0`
`font_01_sfnt_off0000e1f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1F6	11104 bytes
SHA-256: `f0b432a8452e7d38a34ad0a9f127889db6244c549d88835377a35e3fb98a907a`
`font_02_sfnt_off0000fb90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB90	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000113a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x113A2	18672 bytes
SHA-256: `da490c9d487f7596a3448e909d4aa9a84344ac99e02ac8a8b3be7abb98e4343a`

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