PDF malware analysis — malicious · b2c7fbe27d0baf13

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 16:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: eb30be98259125180981c55cb2985802 SHA-1: baaa436874978b8b5c93385bccdf20cddcf09bcf SHA-256: b2c7fbe27d0baf13ada5113a1dab0bf2f569a56b8c6e1b6eb20d28da2aec6894

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of numerous external URLs, many hosted on potentially disposable domains, strongly suggests a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this file as malicious, reinforcing the assessment of a phishing lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

Heuristics 7

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://synerhu.ru/uplcv?utm_term=program+to+reset+android+tablet PDF link annotation
- http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613011ef53b9d---modulazovogatejenemep.pdfIn PDF document text
- http://vinmexindia.com/uploads/kufebaloxonun.pdfIn PDF document text
- http://nujhimachal.in/img/uploads/files/23389759257.pdfIn PDF document text
- https://jungleflightchiangmai.jungle-flight.com/Uploads/files/79454482321.pdfIn PDF document text
- https://leifs-auto.dk/images/file/dapavunevibadileduzoba.pdfIn PDF document text
- http://www.macrolepidoptera.hu/userfiles/files/vizawazabut.pdfIn PDF document text
- http://vdi.vn/userfiles/file/99218989778.pdfIn PDF document text
- http://camara.acessoainformacao.org/uploads/ckfinder/files/49671723387.pdfIn PDF document text
- http://nawaress.com/webroot/js/ckfinder/userfiles/files/vowodoxofinifotokifo.pdfIn PDF document text
- https://by-express.com/upfiles/editor/files/1580614168.pdfIn PDF document text
- http://cdkuys.handysociality.com/upload/files/napanutiv.pdfIn PDF document text
- http://manu-transport.com/documents/file/53522511104.pdfIn PDF document text
- http://retailcop.ca/files/newetovevanisaj.pdfIn PDF document text
- https://clubelsendero.com/img_pag/file/mexabidugamafusudi.pdfIn PDF document text
- http://workontext.ru/media/file/78835832525.pdfIn PDF document text
- https://nutrishop.in/ci/userfiles/files/81558422691.pdfIn PDF document text
- http://nepalbestcargo.com/userfiles/file/34440884023.pdfIn PDF document text
- https://resonanceacteurs.nl/userfiles/file/fojanuvajunusuzorixebini.pdfIn PDF document text
- https://global-product.org/CKEdit/upload/files/31922054993.pdfIn PDF document text
- http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/97578862817.pdfIn PDF document text
- http://myphamasia.net/upload/files/87239360172.pdfIn PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dc062993d815e1958b6ff74703306373/1238649457.pdfIn PDF document text
- http://kipia-nn.ru/userfiles/file/79579795262.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_off0000da35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA35	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f247.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF247	17652 bytes
SHA-256: `2103500b2aa6782024f0a63ac06328ed7f84bf553402c4d6a9bb56edf19528d8`
`font_02_sfnt_off00011f9a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F9A	10732 bytes
SHA-256: `5f51eaccacd02e98b84842d1079203d51134aa0ec062a0773f07d7ab354895d8`

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