PDF malware analysis — malicious · eb062ad07c050914

MALICIOUS

PDF

71.7 KB Created: 2021-09-27 02:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 6f602186b89341587908e6c68715093a SHA-1: 5efcdf7d208fc62b45137d2f95f843dd537f2951 SHA-256: eb062ad07c0509144583ea616b873caa5e42e06c20df299ed694279cc7b7f234

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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=windows+8.1+pro+vl+x64+product+key PDF link annotation
- https://pulsekb.ru/admin/ckfinder/userfiles/files/26703475297.pdfIn PDF document text
- http://vanguardhungary.hu/userfiles/file/95040862319.pdfIn PDF document text
- http://sgo-bage.com/public/files/files/5401712697.pdfIn PDF document text
- http://huyminhplastic.com/upload/files/mazakijajoxekukufo.pdfIn PDF document text
- http://tatvideo.ru/ckfinder/userfiles/files/32962678458.pdfIn PDF document text
- https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309225e7d15---18003920957.pdfIn PDF document text
- http://theartofdesign.nl/ckfinder/userfiles/files/40140734800.pdfIn PDF document text
- http://all-premium.com/user_file/files/54781290700.pdfIn PDF document text
- http://computerdoki.hu/user/file/11486549015.pdfIn PDF document text
- http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef0d5864df---70508825235.pdfIn PDF document text
- https://eastmanllc.com/ckfinder/userfiles/files/rimozatozetikugowejixenuz.pdfIn PDF document text
- http://jysfh.com/upload_fck/file/2021-9-24/20210924153015590742.pdfIn PDF document text
- https://guptajimarriagebureau.com/userfiles/file/23440437135.pdfIn PDF document text
- http://stsmcc.org/www/js/ckfinder/userfiles/files/72434882484.pdfIn PDF document text
- http://soluzionebenessere.eu/userfiles/files/nixefojijewilimiwaxolaj.pdfIn PDF document text
- https://kimansion.com/uploads/file/kivivipefaditabix.pdfIn PDF document text
- http://qwerty.pl/_data/file/9411206412.pdfIn PDF document text
- https://www.poeles-granules-vasconha.fr/ckfinder/userfiles/files/43703196540.pdfIn PDF document text
- https://www.douggoodkin.com/admin/ckfinder/userfiles/files/vurunoxalekizogumibak.pdfIn PDF document text
- https://airin.lv/images/userfiles/file/78532196022.pdfIn PDF document text
- https://cancelaria.pl/galeria/file/67589028766.pdfIn PDF document text
- https://alpinebadmintonacademy.com/ckfinder/userfiles/files/javeginikubafuranagizuli.pdfIn PDF document text
- http://bagiez.com/userfiles/file/pelarezuf.pdfIn PDF document text
- http://3e-machinery.ru/app/webroot/filesfiles/wowarideret.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_off0000b0e0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0E0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c8f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8F2	17208 bytes
SHA-256: `d62c1ee001e2b64212731d79f71805e10fb41bafa27fa42c308a9b61330e637d`
`font_02_sfnt_off0000f5f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5F8	11468 bytes
SHA-256: `2712e189bf2b8d8e23603415a1a77533b8effe9d4e8afb6a8cde415a985da181`

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