PDF malware analysis — malicious · 17f77cbf15a8a6c1

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 14:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5549d17f7d140f50bec54f4cd1af5e26 SHA-1: d256c8beb2c4a0eb4471a79b488cfe155b6d72de SHA-256: 17f77cbf15a8a6c1058a34a26ab8c5f0840425ae4e206f3be0d10fbec83efae1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, indicating a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly support its malicious nature, likely as a phishing or malware distribution lure. The embedded JavaScript is a primary indicator of malicious activity within the PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://wastran.ru/uplcv?utm_term=introduction+to+automotive+mechanics+pdf PDF link annotation
- http://studiotecnicofrisoli.com/userfiles/files/pujapexo.pdfIn PDF document text
- http://ocean-ex.com/images/blog/file/44848459075.pdfIn PDF document text
- http://scantech3d.com/files/velasifubugekebeweko.pdfIn PDF document text
- http://mbeautyconcept.com/upload/content_images/file/sagufavupebobod.pdfIn PDF document text
- https://ntc-container.com/upload/files/bobozaxujutejupiwixewop.pdfIn PDF document text
- http://cristal-in.fr/userfiles/file/88607023865.pdfIn PDF document text
- https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1fd82ba042881af160a83048baae71bb/86664078063.pdfIn PDF document text
- http://campingwithconvenience.com/files/files/ludoletejev.pdfIn PDF document text
- https://on-call-anatomist.org/ckfinder/userfiles/files/lixarusixubesoziwunuxas.pdfIn PDF document text
- http://cpbnatation.fr/fckeditor/userfiles/file/68496331152.pdfIn PDF document text
- http://naasschoolofmotoring.com/fckeditor/userfiles/file/ripowufil.pdfIn PDF document text
- http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12351728914.pdfIn PDF document text
- http://salespate.com/userfiles/file/11394507742.pdfIn PDF document text
- https://www.privathospitaletkollund.com/ckfinder/userfiles/files/paniwabufedenemigej.pdfIn PDF document text
- http://rlmlaw.com/images/edit_images/file/zezuwi.pdfIn PDF document text
- http://munnarinfo.in/userfiles/file/89101909359.pdfIn PDF document text
- https://pielinks.com/UserFiles/file/47355257937.pdfIn PDF document text
- http://mapect.com/upload/fckeditor/file/witukin.pdfIn PDF document text
- https://parlagame.net/calisma2/files/uploads/66637784753.pdfIn PDF document text
- http://fine-trading-knotwork.com/uploads/media/41284571436.pdfIn PDF document text
- http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/37760256414.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rk5uabbucm32bvghhg6hh2e5is/24326514907.pdfIn PDF document text
- http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/20312953270.pdfIn PDF document text
- http://lenosada.sk/editor_uploads/files/dusoben.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_off0000da87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA87	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f299.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF299	18260 bytes
SHA-256: `dc19834c6e0e7993095bc2b46fe992997e6f0502443ca1b74f837a3a997b1758`
`font_02_sfnt_off0001219f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1219F	10956 bytes
SHA-256: `9e0924636084b7c0adaba9eb41ea0cf0edcfa52cbf35e9663d4a6f9c89333b09`

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