PDF malware analysis — malicious · 42d76592475f8944

MALICIOUS

PDF

81.2 KB Created: 2021-09-08 18:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 01366130145cb2c9f122eead4b44403b SHA-1: 1e1e239644096ea377cdd254b7fa585b11923138 SHA-256: 42d76592475f8944facc24a90fde13b9ed9dff9255695791d70a25aa772c51bf

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used for phishing or to download further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the sample is part of a link farm hosted on disposable domains, further supporting a phishing or spam campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=present+tense+simple+worksheet PDF link annotation
- https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/kepunafodobodopapet.pdfIn PDF document text
- http://ancheng-medical.com/uploadfile/files/49520680984.pdfIn PDF document text
- http://wu-pao.com/upfiles/editor/files/badako.pdfIn PDF document text
- http://rogersdesignhouse.com/uploads/files/towikuwibu.pdfIn PDF document text
- https://praktijkbinnenstad.nl/file/zirofawudi.pdfIn PDF document text
- https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/1de0013548ab4aadd7213999ceea11ee/jiwobimunegilerin.pdfIn PDF document text
- http://elandtour.com/FileData/ckfinder/files/20210904_8E0A6A8B40122A84.pdfIn PDF document text
- http://clinicaveterinariabilancino.it/userfiles/files/86503589706.pdfIn PDF document text
- http://singer-island-condos.com/userfiles/files/24362567060.pdfIn PDF document text
- http://gimhaejazz.com/fckeditor/userfiles/image/13487970187.pdfIn PDF document text
- http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/52701427778.pdfIn PDF document text
- http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/lizizu.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613468fb1bb8f---28642422671.pdfIn PDF document text
- https://yuvasarkar.org/userfiles/file/xarif.pdfIn PDF document text
- https://haciendaloscipreses.cl/upload/file/zumemejirevag.pdfIn PDF document text
- http://noithatsah.com/webroot/img/files/zuwotipupatuner.pdfIn PDF document text
- http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de96bda54---sekoximebadokivamelad.pdfIn PDF document text
- https://kaptenhoki.org/contents/files/68750312332.pdfIn PDF document text
- https://bdaudit.ro/userfiles/file/15997184767.pdfIn PDF document text
- http://balone.net/_upload/file///godirejorarizufututon.pdfIn PDF document text
- http://tcsm62.org/uploads/news/file/43052209453.pdfIn PDF document text
- http://gamebonda.com/ckupload/files/musalotonumutiponopunerob.pdfIn PDF document text
- http://www.cda.org.hk/ckfinder/userfiles/files/23728716475.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_off0000db39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB39	16992 bytes
SHA-256: `783c81699d88838ace9c6f2cb4ec7f2d502cb8205fe0481ea8223869839ddb9c`
`font_01_sfnt_off0001072d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1072D	10536 bytes
SHA-256: `05137894458adb30fd930fe9f796a6c79910fe0e93562f570fe3bb901705be36`
`font_02_sfnt_off00011f05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F05	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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