PDF malware analysis — malicious · 437e5aab479b92ea

MALICIOUS

PDF

97.3 KB Created: 2021-09-27 18:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 03598ff9936224ef00ab42cad89f9a16 SHA-1: 46764d780318bf9a1a72422fd603b38d685fe2c6 SHA-256: 437e5aab479b92ea41ff91cc62b8856259d620d7315d5a66c153c88b56031acf

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=mozart+lacrimosa+piano+pdf PDF link annotation
- http://vivatbacchus.hu/files/file/zosezaxajodugagutexobupog.pdfIn PDF document text
- http://laulumaja.fi/ckfinder/userfiles/files/fupumezitofako.pdfIn PDF document text
- http://www.ettermanenterprises.com/ckfinder/userfiles/files/78770334591.pdfIn PDF document text
- https://dadesigning.com/daduserfiles/files/13013120044.pdfIn PDF document text
- http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e76b8671a4---sigixegaruzudezugu.pdfIn PDF document text
- https://datawire.gr/files/files/92670913239.pdfIn PDF document text
- https://nullemont.fr/nullemont/ckfinder/userfiles/files/4649368993.pdfIn PDF document text
- https://foodphotoshop.com/userfiles/files/zesesogamibimoz.pdfIn PDF document text
- http://cngwalk.com/fckeditor/userfiles/image/jezigamewiboma.pdfIn PDF document text
- https://alternativecarrepair.com/userfiles/file/sidajobutamakawinow.pdfIn PDF document text
- http://kartelabasligi.com/images_upload/files/80658060415.pdfIn PDF document text
- http://lica.plovdivweek.com/js/ckfinder/userfiles/files/31479407075.pdfIn PDF document text
- http://gagutp.com/sa_upload/userfiles/file/20210915215648.pdfIn PDF document text
- https://gbp.dropship-online.com/userfiles/files/44468348236.pdfIn PDF document text
- http://smolninskayahotel.com/userfiles/file/lasabivopapokes.pdfIn PDF document text
- https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/7e6b7ae92762f96b2563f6fb3090e392/9722193624.pdfIn PDF document text
- http://basketaci.cz/UserFiles/File/39825804935.pdfIn PDF document text
- http://daotaonhaccong.com/uploads/userfiles/file/50061818697.pdfIn PDF document text
- http://odpadykj.cz/UserFiles/File/88084077073.pdfIn PDF document text
- http://riccaassociati.eu/userfiles/files/2584559543.pdfIn PDF document text
- http://sabancilojistik.com/userfiles/file/99064822543.pdfIn PDF document text
- http://domario.ru/userfiles/file/99806922936.pdfIn PDF document text
- http://homokkepek.hu/editor_up/vajovetime.pdfIn PDF document text
- http://szm.hu/userfiles/file/sufelinujufasofixisip.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_off00010dc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DC9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000125e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125E0	10700 bytes
SHA-256: `ba2e6c87dbd02ce45ab33ac53dfbcb7955e51e148aade8a96080d5e455eb8867`
`font_02_sfnt_off00013e69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13E69	21308 bytes
SHA-256: `edfb435af99896e4ca6423dc0509818262bf77cb6948114025a5f59788638a09`

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