PDF malware analysis — malicious · 7c4b0f9a3c878f32

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 08:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: b33808afa2b0b980b47d38a06c606b63 SHA-1: 5e3ef8b1d6b36c08aad9d768a870bd0c3ea405e3 SHA-256: 7c4b0f9a3c878f32fbd5fba66fad58a34a7dd7fe10c05f7d7fe17b947ea821da

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

Nyx PDF Classifier malicious score 0.9952

Heuristics 5

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.
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://inwebjor.ru/uplcv?utm_term=hidden+valley+road+inside+the+mind+of+an+american+family+pdf PDF link annotation
- http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/10348320300.pdfIn PDF document text
- https://larustt.com/upload/ckfinder/files/fekine.pdfIn PDF document text
- http://thanhcongtechtra.com/upload/files/jiwusov.pdfIn PDF document text
- http://poliinc.com/upload/files/17402117021.pdfIn PDF document text
- https://jeanmarcrobion.fr/userfiles/file/5386935768.pdfIn PDF document text
- http://euro-m.si/web/dokumenti/file/tuvixuzojejuwidu.pdfIn PDF document text
- http://pttaccounting.com/userfiles/files/lexilepitaji.pdfIn PDF document text
- http://orikon.net/Images_upload/files/fafanaberunomederurajegi.pdfIn PDF document text
- https://braintreeclinics.com/app/webroot/img/files/zurupemupibew.pdfIn PDF document text
- http://saxonrt.hu/img/userfiles/files/gaxitoluxigewokebu.pdfIn PDF document text
- http://playeasypiano.com/resources/fck_images/80713953194.pdfIn PDF document text
- http://shukokai-voves.fr/userfiles/file/81509880469.pdfIn PDF document text
- http://jonme.net/ckupload/files/nukubogunobixanusezi.pdfIn PDF document text
- http://greatnice.club/updatefiles/file/20002023624.pdfIn PDF document text
- https://chorland-dining.com/webroot/editor-uploads/files/kikivufejuban.pdfIn PDF document text
- https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5cadd0c939036e6501c6eac3d57d117a/sibotugojovogafudulo.pdfIn PDF document text
- https://minhgianggroup.vn/upload/files/18117925020.pdfIn PDF document text
- http://incomsistema.ru/ckfinder/userfiles/files/moribinokevojokam.pdfIn PDF document text
- http://www.lalorraineperdue.com/documents/zobakivovopejovevamuke.pdfIn PDF document text
- http://youzedu.com/ckimages/files/20210906050542328378.pdfIn PDF document text
- https://gabinetpro.pl/kosmetyczka/krakow/files/6105683973.pdfIn PDF document text
- https://peiitw.com/Upload/ckeditor/files/79947668407.pdfIn PDF document text
- http://urdu-hadith.com/survey/userfiles/files/53455031452.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://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_off0000de59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE59	11056 bytes
SHA-256: `3635be51622568525bbac00d0b40cffd0da69060ab7f16a832eaceb4b8eafdad`
`font_01_sfnt_off0000f7e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF7E4	18160 bytes
SHA-256: `eb7a4051d481ff7e91f7ff1b61e30713e858728bff29d3c77c5bdd8060cc8c20`
`font_02_sfnt_off000126c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x126C4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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