PDF malware analysis — malicious · c12914630b48b506

MALICIOUS

PDF

83.4 KB Created: 2021-09-15 13:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7ab4d5c87b09ab212f28015709cf01fb SHA-1: 3e262060f990eabea815e623c485a4e3ee9b60ec SHA-256: c12914630b48b5065a5b6b2322b05e1a18b1683ba24f14766fc6fad2f230aff7

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of numerous external URIs, many of which appear to be part of a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=unlock+phone+without+pressing+ok PDF link annotation
- http://villalapinetafavignana.it/userfiles/files/genumagadazi.pdfIn PDF document text
- http://immobiliareborghi.com/userfiles/files/63990754635.pdfIn PDF document text
- https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/mimuxulawubidofav.pdfIn PDF document text
- https://solturism.ro/images/file/magegisitokamosesu.pdfIn PDF document text
- https://remoteyourstaff.com/calisma2/files/uploads/bakolixawutewadodivibofi.pdfIn PDF document text
- http://a2kat.ru/userfiles/file/6706813015.pdfIn PDF document text
- https://arab-hams.com/Ups/files/noketom.pdfIn PDF document text
- http://aqs-group.it/userfiles/files/46231120012.pdfIn PDF document text
- https://apskarota.org/userfiles/file/52014866761.pdfIn PDF document text
- http://sitarofindiamd.com/userfiles/file/nesepadizoti.pdfIn PDF document text
- http://keramann.ru/uploads/files/jadugibuloz.pdfIn PDF document text
- http://simsvizag.com/contentimages/file/16028653420.pdfIn PDF document text
- https://x-leather.com/radsportfiles/file/fapufogat.pdfIn PDF document text
- http://sushikyototogo.com/uploads/files/lumijenilusawupekoda.pdfIn PDF document text
- https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f79b0ef5b---lofab.pdfIn PDF document text
- http://orel-trinity.ru/sites/default/files/file/58927008962.pdfIn PDF document text
- http://theexplorerthai.com/userfiles/files/noraxowevewifonibov.pdfIn PDF document text
- http://hyunsin.net/userfiles/file/10678378220.pdfIn PDF document text
- http://sunil.kr/uploadfile/fckeditor/file/4443026355.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137467155d89---sugubewuxikigavipawuzupa.pdfIn PDF document text
- http://archiprojektai.lt/app/webroot/uploads/userfiles/files/tazuwi.pdfIn PDF document text
- https://gazeta-msp.pl/user_files/File/6260998497.pdfIn PDF document text
- http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/45904385645.pdfIn PDF document text
- http://clevio.biz/fckUpload/file/teligupoponoxelupipi.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_off0000de1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE1F	18492 bytes
SHA-256: `e28f72d9fb7de0130e4f26e739ec9fac677a79e77427d6e79dbf3f6f0814e3f8`
`font_01_sfnt_off00010ed5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10ED5	10776 bytes
SHA-256: `32f9e9c3a92d4219e97e80fee8b95e3f9a304f53a41c55aec744a464527547e5`
`font_02_sfnt_off000127ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127AD	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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