PDF malware analysis — malicious · f1849128f33b4fc2

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 13:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 5cc255052bd1f5b7e3db2ad086be874a SHA-1: 44ef91e29ac03d6beeb2d053bd41bf9ad965d1b5 SHA-256: f1849128f33b4fc210721322c3853e4b420416dd5fd6cb9c3d1413ff36b3712a

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that triggers an external URI redirect. This behavior, combined with the ML classifier and ClamAV detection, strongly suggests a malicious intent to lure the user to a compromised site. The numerous embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicate a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. 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://crysiq.ru/uplcv?utm_term=download+the+sims+4+mod+apk+unlimited+money+for+pc PDF link annotation
- https://nbtele.com/en/cache/fck_files/file/getufajefoga.pdfIn PDF document text
- https://amrapalispot.com/userfiles/file/tibobepotuwe.pdfIn PDF document text
- http://thanhtindesign.vn/uploads/image/files/92145334981.pdfIn PDF document text
- http://marymo.ru/uploads/files/kapujotiwenu.pdfIn PDF document text
- http://cutyoursupport.com/userfiles/file/78178072822.pdfIn PDF document text
- https://equalitas.es/userfiles/file/35215857845.pdfIn PDF document text
- https://osiindia.org/ckfinder/userfiles/files/82349405737.pdfIn PDF document text
- https://xulynuocphangiathinh.vn/images/pic/file/netisudujabekisesaxijovaw.pdfIn PDF document text
- http://www.phuongdonggolf.vn/app/webroot/uploads/files/betosapulobok.pdfIn PDF document text
- http://mikomisushiwc.com/uploads/files/jovoposagomovixu.pdfIn PDF document text
- https://hkparkkonutlari.com/image/files/40116093172.pdfIn PDF document text
- https://avukatwebsitesi.trakyasoft.com/upload/files/90117354395.pdfIn PDF document text
- http://galsabino.it/userfiles/files/gowijoxomobalikaxibi.pdfIn PDF document text
- http://nkmate.com/FileData/ckfinder/files/20210903_7CCF2C37700FB3D1.pdfIn PDF document text
- http://15881588.com/ckupload/files/pizosaxegutizatevoz.pdfIn PDF document text
- http://think6.net/ckfinder/userfiles/files/20210907050745.pdfIn PDF document text
- https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/98140922025.pdfIn PDF document text
- https://citronixdeflection.com/nbloom/fckuploads/file/sawisafuzubezapebowotaje.pdfIn PDF document text
- https://greenbins.ca/ckfinder/userfiles/files/limuxonogabofazanif.pdfIn PDF document text
- http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/63218532846.pdfIn PDF document text
- https://saksisan.com/upload/ckfinder/files/80008530442.pdfIn PDF document text
- http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1cadc45dd---fujipukemezasamidumuva.pdfIn PDF document text
- http://apisicul.com/userfiles/files/jorin.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_off0000ea30.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA30	11356 bytes
SHA-256: `7ef83b5f6bea27a71c3062bafcfb83f8ccb2fc1b39940f919b1fd7eadee22b88`
`font_01_sfnt_off000104d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x104D8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011cea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CEA	17508 bytes
SHA-256: `ccefcdbf87ab9f659db817af917d12a988c667bb85153ae9a89be98af3b27e3b`

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