PDF malware analysis — malicious · a1e130f7c31b4d25

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 16:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 3f24828aeddc51f267030081ef9ff324 SHA-1: 5453619f9e821b12f145eb96e617986f6e2ad79d SHA-256: a1e130f7c31b4d25197e0f3dc293d487a5370b970d6a21764d0d15a690a0a573

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, and one of the embedded URIs, 'https://chcial.ru/uplcv?utm_term=motion+leap+pro+apk+free+download', suggests a lure for potentially malicious software downloads. The ML classifier also strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 5

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.
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://chcial.ru/uplcv?utm_term=motion+leap+pro+apk+free+download PDF link annotation
- http://cheers-gifts.com/userfiles/23278155416.pdfIn PDF document text
- http://autothudo.vn/upload/fck/file/43527360323.pdfIn PDF document text
- http://massarentearchitettura.com/userfiles/files/37419821106.pdfIn PDF document text
- http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96bad253f---gofisagexuxazogeve.pdfIn PDF document text
- https://bibliotheque-des-arts.com/ckfinder/userfiles/files/9883043532.pdfIn PDF document text
- https://excellencetogether.com/img/files/file/64822247984.pdfIn PDF document text
- http://solartgaleria.hu/images/file/kivuvilek.pdfIn PDF document text
- http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1758866183614f758c091af.pdfIn PDF document text
- http://volker-issmer.de/userfiles/file/xebaxoxakijad.pdfIn PDF document text
- http://kvbm.org/pds/userfiles/files/43467894260.pdfIn PDF document text
- https://sk-elektron.ru/ckfinder/userfiles/files/roteduligan.pdfIn PDF document text
- http://www.bluefashion.cz/ckfinder/userfiles/files/13082465210.pdfIn PDF document text
- https://xn--nmqu14inmf.com/upload/files/xetavezofowix.pdfIn PDF document text
- http://tscyw.net/userfiles/file/20210928214421_wswctr.pdfIn PDF document text
- http://parfumerieindex.nl/images/uploads/82675998690.pdfIn PDF document text
- https://s-oil.hoakhanh.vn/uploads/image/files/30567922823.pdfIn PDF document text
- http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/81324606994.pdfIn PDF document text
- https://universitecentrale.net/uploads/FCK_files/file/59284653996.pdfIn PDF document text
- http://studiosimonepantaleo.it/userfiles/files/gaxafijijabarepemo.pdfIn PDF document text
- http://sgrappresentanze.eu/userfiles/files/25420758968.pdfIn PDF document text
- https://parisnordmedical.fr/docs/file/98582807100.pdfIn PDF document text
- https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/bfb664b0a2821c5e4078c6354541471a/68037728141.pdfIn PDF document text
- http://aguito.madteam.net/ckfinder/userfiles/files/30195142242.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_off0000ae2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAE2C	10496 bytes
SHA-256: `e6b4dd22d30ddf10ea125883ddcd3fc64aa587b8cd57788074e8a9b039ecd8a8`
`font_01_sfnt_off0000c62f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC62F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000de41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE41	16636 bytes
SHA-256: `ccc24ad83e844542b86489101a845c4966a154320514b38c00c6d0ef56230fce`

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