PDF malware analysis — malicious · 72f98e55f67794b3

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 17:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 948cc6b30ecb32b96e83c3692e86ed77 SHA-1: 8545482a65b5e539f85d7bcc77f4bbe834492632 SHA-256: 72f98e55f67794b362865f76be8ae484335d59cff6a9c626d1346ffddc4cf33b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and multiple external URIs, suggesting it is designed to redirect users to potentially harmful websites. The presence of numerous links and disposable hosting points towards a link farm or phishing campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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=magic+rampage+apk+download PDF link annotation
- http://weilandensemble.nl/ckfinder/userfiles/files/84525202646.pdfIn PDF document text
- http://hunting.kg/userfiles/file/miwunufexizadetevexu.pdfIn PDF document text
- http://toyteepee.com/uploadfiles/file/210907210829061208zkfais.pdfIn PDF document text
- http://smolensk-bakaleya.ru/userfiles/file/peramenivefidetidopo.pdfIn PDF document text
- https://cubic.is/userfiles/file/tobotawosep.pdfIn PDF document text
- http://icloudcleaners.com/uploads/account/autoresponderfiles/lubofu.pdfIn PDF document text
- https://safetypadlocks.eu/eurostyl/photos/file/26297518033.pdfIn PDF document text
- https://movie2book.com/userfiles/file/dadadetesaridege.pdfIn PDF document text
- http://acrclubinversores.com/files/galeria/files/35165934376.pdfIn PDF document text
- http://noxsun.com/jingkelun/userfiles/files/20210910221347.pdfIn PDF document text
- http://ghibms.com/userfiles/files/fapubibagusijipitutew.pdfIn PDF document text
- http://carzip.biz/files/uploads/files/zunetevivofo.pdfIn PDF document text
- https://5ky13lu3-1251.com/contents/files/nagafase.pdfIn PDF document text
- https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/28294422523.pdfIn PDF document text
- http://sinching.com/uploadpic/files/202109021308579782.pdfIn PDF document text
- http://thebeautyofdesign.nl/ckfinder/userfiles/files/padebipijikevetijoxumev.pdfIn PDF document text
- http://wedooverseas.com/userfiles/file/vilaxagefiwukopejem.pdfIn PDF document text
- https://adepotcustom.com/UploadFiles/file/20210913014356146.pdfIn PDF document text
- http://dainindo.com/Uploads/userfiles/files/87073856857.pdfIn PDF document text
- http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4889c7d10---32330523427.pdfIn PDF document text
- http://artkulinaria.pl/sites/default/files/file/gasalopebufisa.pdfIn PDF document text
- http://uhorder.com/upload/files/80288593702.pdfIn PDF document text
- http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161359b0a945f9---85074475129.pdfIn PDF document text
- https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/61858488047.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_off0000d7c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7C6	10760 bytes
SHA-256: `79112b6d012534c2f02c27a47fac88146cb3775bc05834994fc8af5907cce8db`
`font_01_sfnt_off0000f054.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF054	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010866.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10866	17000 bytes
SHA-256: `0feb659578bc6818d08485e57ffe4f4e5ecf71e49c9c140876a32f9ad0909c14`

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