PDF malware analysis — malicious · 99f08ffbbe0474f9

MALICIOUS

PDF

92.2 KB Created: 2021-09-16 12:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: fdd4236f2eb8a32924dfd476d6b740ae SHA-1: 9817d53e7f863eac72e20473e14b35a343dd72ce SHA-256: 99f08ffbbe0474f971567e661fa1aca2b911ab514f54564c769a650d533b6d95

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9905

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://krisoc.ru/uplcv?utm_term=ps3+android+emulator PDF link annotation
- http://clingac.es/d/files/nukode.pdfIn PDF document text
- http://juha.be/_files/file/69697270592.pdfIn PDF document text
- http://mclarenquartz.in/ci/userfiles/files/77712302104.pdfIn PDF document text
- http://dailycan.com/userfiles/files/46009460771.pdfIn PDF document text
- http://villalapinetafavignana.it/userfiles/files/16338220211.pdfIn PDF document text
- https://telewebmarketing.com/FCKeditor/file/292098029.pdfIn PDF document text
- http://kingkady.com/uploadfile/files/62099985246.pdfIn PDF document text
- http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1acd724eb---46496823632.pdfIn PDF document text
- https://eastmanllc.net/ckfinder/userfiles/files/wezigo.pdfIn PDF document text
- http://hzqzg.com/d/files/wejixotuwukagamikobuwasow.pdfIn PDF document text
- https://pomacanthe-art.fr/imagebeforeafter/files/62928052684.pdfIn PDF document text
- http://szhlfz.net/upload/nisodelavatupobot.pdfIn PDF document text
- http://nasledie-sluck.by/var/upload/file/64398481228.pdfIn PDF document text
- http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/xazukugik.pdfIn PDF document text
- http://world-housing.jp/ckfinder/userfiles/files/vanamibatup.pdfIn PDF document text
- https://kamhosting.nl/ckfinder/userfiles/files/28856317253.pdfIn PDF document text
- http://candientushinko.com/images/file/weribikukogede.pdfIn PDF document text
- https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/57929805385.pdfIn PDF document text
- http://kasintorn.com/images/upload/files/dezesuvef.pdfIn PDF document text
- https://fnb-concepts.com/images/uploads/files/55725173801.pdfIn PDF document text
- https://thebottombillion.org/business_school/uploads/file/14624967648.pdfIn PDF document text
- http://status.cz/UserFiles/File/taxemanesokatazit.pdfIn PDF document text
- http://longbeach.ilovepokebar.com/uploads/files/lipenisepipame.pdfIn PDF document text
- http://mq-water.net/upload/zipazaxoperatenokemar.pdfIn PDF document text
- https://namratalakhotia.com/userfiles/files/jukunofoga.pdfIn PDF document text
- http://mobilesamara.com/img/files/file/toxasuvewotilofutik.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_off00010235.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10235	18728 bytes
SHA-256: `581fa1f257761c32da8db853eefed9af53822eaf48dc9734131954fcc957534e`
`font_01_sfnt_off000132ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132AC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00014ac3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14AC3	10684 bytes
SHA-256: `6c34b767e1d9dcc7623b47b085470f4a59e5d4dadee9bc8ba5754f230edc0a69`

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