PDF malware analysis — malicious · 7b3e390ba5d0cd08

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 08:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: a87d7e96f476383b04729945cfeda481 SHA-1: 3278d86f41cda4926b3e4d68073b4b608c20f2cc SHA-256: 7b3e390ba5d0cd0863b789e63c9499ecdaa922040315902da2d24959845ac4da

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document is designed to trick users into downloading a password-protected archive, a common tactic to bypass security gateways. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://crewmak.ru/uplcv?utm_term=how+to+reset+a+phone+password PDF link annotation
- http://lucchetta.net/userfiles/files/fubusoporuxal.pdfIn PDF document text
- http://beiwendq.com/data/attachment/file/99264063487.pdfIn PDF document text
- http://quanhoangtsi.com/upload/quangtri/files/gibumexo.pdfIn PDF document text
- http://classicalgardenornaments.com/uplds/file/rogizur.pdfIn PDF document text
- http://abovomedia.hu/_user/file/76803111567.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614488de3e125---wedulejomupaboma.pdfIn PDF document text
- http://stacjaregeneracja.pl/userfiles/file/wewofosogulekukawaxej.pdfIn PDF document text
- https://1877painters.com/FCKeditor/file/43397623773.pdfIn PDF document text
- http://uralcomservis.ru/crn_fls/crn_files/wozigusuna.pdfIn PDF document text
- http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/zijulodejeweb.pdfIn PDF document text
- http://verynailscm.com/user_img/file/nafoloweguvi.pdfIn PDF document text
- https://sherwoodchamber.org/ckfinder/userfiles/files/7515651486.pdfIn PDF document text
- https://espritgt.com/userfiles/file/fabazowe.pdfIn PDF document text
- http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/38727255751.pdfIn PDF document text
- http://vinag7furniture.com/app/webroot/files/editor_upload/files/41516590671.pdfIn PDF document text
- http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/wagifofijipibu.pdfIn PDF document text
- http://freeorden.com/media/file/38859093467.pdfIn PDF document text
- http://csc-0411.com/userfiles/file/20210906070256_kuvd36.pdfIn PDF document text
- http://terezszilvia.com/images/uploaded/file/39690657662.pdfIn PDF document text
- http://assisdrive.pt/userfiles/file/84461056675.pdfIn PDF document text
- http://mrhobbscoffee.com/images/uploads/file/wokanubali.pdfIn PDF document text
- http://hypotekaprezamestnancov.sk/res/file/lotex.pdfIn PDF document text
- http://joyearland.com/ckfinder/userfiles/files/37688838715.pdfIn PDF document text
- http://abbwingslynnhaven.com/uploads/files/fukusogagenunitibanijopeg.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_off0000c3f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC3F6	10428 bytes
SHA-256: `1adca47b7e6aef69c317cbe098e87dd272cd7dfc4f7c39ac566b86c39e144c61`
`font_01_sfnt_off0000db97.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB97	16964 bytes
SHA-256: `8169ab5ce741b88039108b09771c0b72f725e7fa2f9b0c9b9bcf36e7a7701754`
`font_02_sfnt_off000107c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107C1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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