PDF malware analysis — malicious · 758f78788b5e2343

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 15:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 7d6a4837529102b0715254d2e616563f SHA-1: 36515041e479d21e25d952724f00414ce83a215d SHA-256: 758f78788b5e23437820dadf7d0019ac664b44666df8e36a72fc8993e8f7f1b2

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document is part of a phishing or scam campaign by directing users to a collection of potentially malicious links. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9950

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346cda1402e---ridavufi.pdf In PDF document text
- http://bandenplaats.nl/cmsimages/file/xeranuzaw.pdfIn PDF document text
- http://vankouwenenmastop.nl/UserFiles/file/36083226020.pdfIn PDF document text
- http://kssi.ir/public/userfiles/file/ripogidel.pdfIn PDF document text
- http://netcentricnj.com/ckfinder/userfiles/files/demumanovofupomifo.pdfIn PDF document text
- http://anthonyvienna.com/sites/default/files/file/tusemuraregoboxir.pdfIn PDF document text
- http://saveursetsavoirs.fr/image/file/fevebunovaf.pdfIn PDF document text
- https://108pizza.pl/uploads/userfiles/files/kijarujatepaxiwon.pdfIn PDF document text
- https://tidurmalam2.com/contents/files/xivalubaginemipulenabop.pdfIn PDF document text
- https://feniks9.ru/ckfinder/userfiles/files/fimunep.pdfIn PDF document text
- http://sevvalturizm.com/rsm/files/52374804541.pdfIn PDF document text
- http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/wewonom.pdfIn PDF document text
- https://samuelben-horin.com/userfiles/file/givivazaxuzuxiriku.pdfIn PDF document text
- http://phdpecs.hu/userfiles/files/pozelitesuwapijaz.pdfIn PDF document text
- https://birotex.rs/images/files/jodivabezitu.pdfIn PDF document text
- https://cytokin.ca/upload/editor/file/32388731445.pdfIn PDF document text
- https://ryokanclub.com/FileData/ckfinder/files/20210902_68A7689CF3EC92DB.pdfIn PDF document text
- https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384923cf606---42522515647.pdfIn PDF document text
- http://geriatriccarenewjersey.com/userfiles/files/wifizejiguxepuz.pdfIn PDF document text
- http://sissonne.hu/editor_up/93472985094.pdfIn PDF document text
- http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/perumesidanazanezo.pdfIn PDF document text
- https://er-cardiff.com/eurostyl/photos/file/68812360779.pdfIn PDF document text
- http://caphegiabao.com/upload/fck/file/nalalosafoxetesapof.pdfIn PDF document text
- https://hotel-la-licorne.fr/userfiles/file/muzudosiwu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+become+a+straight+a+student+book+downloadPDF link annotation
- 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_off0000d7a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7A9	16952 bytes
SHA-256: `422d37ec3a00cc2aafa3d19e214e669af209739185140f8087b7512bc6a54783`
`font_01_sfnt_off000103a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103A6	11224 bytes
SHA-256: `5af074cd7fdea1c4a188c8795c909c6a244020320a556b3bbe624ec041ea8557`
`font_02_sfnt_off00011d94.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D94	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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