PDF malware analysis — malicious · f37f91cadf7d86d2

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 08:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: da537b13d49af481fd2548d582dcfb98 SHA-1: 2237c6eab11f50880c0fea012c47470cd125d93e SHA-256: f37f91cadf7d86d2ff4d30be848383a855a8310c249fa6d6171a360d97fb6158

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=phim+cap+3 PDF link annotation
- https://toananhmedical.com/uploads/files/nifugitubo.pdfIn PDF document text
- http://mesterteto.hu/userfiles/file/32783350599.pdfIn PDF document text
- http://greenegiving.aboutgiving.net/sites/default/files/editor/file/61178949880.pdfIn PDF document text
- https://kede.org/userfiles/file/rerowazotajezujudirote.pdfIn PDF document text
- http://otczenacts.com/media/files/vowabofuloboge.pdfIn PDF document text
- http://usarsenal.it/userfiles/files/88097308962.pdfIn PDF document text
- https://purmoradiatoriai.lt/images/files/foxadepadikobunene.pdfIn PDF document text
- http://bibrka-school.org.ua/ckfinder/userfiles/files/goriloforesidiwoteba.pdfIn PDF document text
- https://lexcyberia.com/userfiles/files/zakunoxoxunexar.pdfIn PDF document text
- http://unite-chem.com/upload/files/3540380716.pdfIn PDF document text
- https://ganganagardentist.com/userfiles/file/nakudixezelaju.pdfIn PDF document text
- http://hamkr.com/userData/board/file/71493618972.pdfIn PDF document text
- http://mwcapital.net/ckfinder/userfiles/files/6411647495.pdfIn PDF document text
- http://fundacionecla.org/resources/original/file/4495596918.pdfIn PDF document text
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613073de3dfe5---balokukisabaxar.pdfIn PDF document text
- http://neurooperations.com/ckfinder/userfiles/files/51933338500.pdfIn PDF document text
- https://feldmann-spedition.de/pics/userfiles/file/1239378464.pdfIn PDF document text
- http://eapver.com/upload/ckimg/files/202109090601272240.pdfIn PDF document text
- http://sewakendragroup.com/userfiles/file/29609000832.pdfIn PDF document text
- http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/62300011330.pdfIn PDF document text
- http://talcmanagement.com/uploaded_files/userfiles/files/35570370878.pdfIn PDF document text
- https://domilot.com/uploader/files/dagajape.pdfIn PDF document text
- http://obchodsezlatem.cz/upload/files/36494572783.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_off0000b064.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB064	14960 bytes
SHA-256: `3607e22b51ce970891f5ea94414630ceb6b8f3c8c208ce94d32761a9ff0e5880`
`font_01_sfnt_off0000d5d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5D5	10044 bytes
SHA-256: `4adc2825786484b9f6bf49bb2f12a8b2dbff8175d417c827d78540db9b2fd3a9`
`font_02_sfnt_off0000ec1a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC1A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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