PDF malware analysis — malicious · d8c85fa5e99bd2a8

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 23:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: c898d9b35f7655b1b76bbc6cf197f6be SHA-1: 6eaeedc8a4939d15120bc896f69f0383df81347c SHA-256: d8c85fa5e99bd2a8f16763906eaee855e04d0b24cf2055046aa6c466cb8ece6e

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware delivery document. The presence of a link farm with disposable hosting further supports a malicious purpose, likely to redirect users to a compromised site.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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=whatsapp+messenger+android+google+play PDF link annotation
- http://slesnick.net/userfiles/files/75416669622.pdfIn PDF document text
- http://hillsdalehorseboarding.com/ckfinder/userfiles/files/lakevupek.pdfIn PDF document text
- http://gzperson.com/uploadfile/files/51890324453.pdfIn PDF document text
- http://cc-loges.com/uploads/file/nekurojopexesujazik.pdfIn PDF document text
- http://droneducational.com/admin/userfiles/file/nexawamoxebuvalafibapa.pdfIn PDF document text
- http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/66188133830.pdfIn PDF document text
- http://diysmart.net/userfiles/file/dikimogazorasaj.pdfIn PDF document text
- http://esoftland.com/userfiles/file/sinajojunoxitil.pdfIn PDF document text
- https://amadesafar.ir/basefile/amadesafarir/files/33032421018.pdfIn PDF document text
- http://www.adarshvidhyasankul.org/userfilesfile/29151737983.pdfIn PDF document text
- http://emaaravm.net/upload/files/12435290126.pdfIn PDF document text
- https://hlj-vibration.com/uploads/image/20210904/files/20210904040725.pdfIn PDF document text
- https://spacio.hk/attachment/file/folipulusex.pdfIn PDF document text
- http://savoie-outils-coupants.com/ckfinder/userfiles/files/xetugipimalav.pdfIn PDF document text
- https://snoman.mb.ca/ckfinder/userfiles/files/senerafineremofosivaxera.pdfIn PDF document text
- http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/90490866656.pdfIn PDF document text
- http://intertravel.hu/_user/file/98433460072.pdfIn PDF document text
- http://konferencii.org/js/ckfinder/userfiles/files/41962161503.pdfIn PDF document text
- https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/lawezuroguviwepafifex.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342bd309bc7---52851888907.pdfIn PDF document text
- http://teranor.com/ckfinder/userfiles/files/xulijodesutomeduwupofax.pdfIn PDF document text
- http://tecsun-moscow.ru/docs/file/69526202498.pdfIn PDF document text
- https://fallahi-sch.com/userfiles/file/24827889675.pdfIn PDF document text
- https://auto826.com/uploads/files/39585079685.pdfIn PDF document text
- http://gzmzwl.com/Uploadfiles/files/vunutekekevape.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_off0000db9f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB9F	10948 bytes
SHA-256: `50ad5052f929be413d6fcf21b5e767bc487b5e60189e06cf96ba001a1e1c140f`
`font_01_sfnt_off0000f49c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF49C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010cae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CAE	16828 bytes
SHA-256: `c5204e4d3f95bbb025bff64eddf058120971c37e3aa1dd32270c05ae3ad99d62`

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