PDF malware analysis — malicious · 9b3c82f21bd7d50a

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 07:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: be4cea167e55298533046fa753f7152d SHA-1: 18baa70bbd79bd4d207e6b5aebc245a312241718 SHA-256: 9b3c82f21bd7d50a813ae0ab09888b069029321ab995a27a2c0c9865a052e12d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm strategy. The embedded JavaScript likely serves to redirect users to one of the numerous external URLs, which are designed to host phishing content or further malware. The PDF's structure and numerous distinct hosts suggest a coordinated effort to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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://huntic.ru/uplcv?utm_term=temple+run+princess PDF link annotation
- https://12shio3.com/contents/files/tifavax.pdfIn PDF document text
- https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/zatamaximiniz.pdfIn PDF document text
- http://baschin-heizung.de/meineBilderAlbertGrundschule/file/xipupovefivimubevig.pdfIn PDF document text
- http://sangjeom.com/userfiles/file///surakaxabudufonuja.pdfIn PDF document text
- https://aljazeerahdrilling.com/userfiles/files/83797755503.pdfIn PDF document text
- https://u15.ch/ckfinder/userfiles/files/61039206534.pdfIn PDF document text
- http://i-harmonics.com/upload/files/27768375128.pdfIn PDF document text
- http://www.llmhospital.com/www/js/ckfinder/userfiles/files/97640063103.pdfIn PDF document text
- http://www.gonouvellezelande.com/files/vamilageguneruxikukojob.pdfIn PDF document text
- https://soudurelauziere.com/upload/editor/file/88900858405.pdfIn PDF document text
- https://netlandschool.cl/files/juvopuvepezotavuxogosemaf.pdfIn PDF document text
- https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/sufodivavelulewajeb.pdfIn PDF document text
- https://pirkitpadangas.lt/ckfinder/userfiles/files/tezozazixijedajefaj.pdfIn PDF document text
- http://splogservice.ru/content/files/ratisasopadugadubuf.pdfIn PDF document text
- http://msslink.ru/userfiles/files/gemejixuvuno.pdfIn PDF document text
- http://clinicaveterinariagussago.com/userfiles/files/pizibo.pdfIn PDF document text
- http://donghotam.com/luutru/files/27929211848.pdfIn PDF document text
- https://abzesolar.com/uploads/files/gaderaritusatokexukokize.pdfIn PDF document text
- http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/16387826066.pdfIn PDF document text
- https://stpatswatertown.org/ckfinder/userfiles/files/disupipakase.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/466dc15e7a74ef7cccf031d2b64a4955/5310688658.pdfIn PDF document text
- http://clairerolo.com/userfiles/file/48258893484.pdfIn PDF document text
- https://debden.org/userfiles/file/In PDF document text
- http://denda.co.kr/ckfinder/userfiles/files/toxexekexedi.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_off0000c695.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC695	18424 bytes
SHA-256: `b45ef394f69566cffad243c9d285647497c793ba0130ca190640a2fb0000f62e`
`font_01_sfnt_off0000f6a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6A6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010ebd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EBD	10216 bytes
SHA-256: `dd8177ec7be6b6c78cb068f43128881549921a18c98494f5dfc31b53b10e277e`

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