PDF malware analysis — malicious · 9113041dbca3e115

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 00:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 9a86d790fc35abd5f6c564ec078d8fd0 SHA-1: 4bd7fc35ce1c096cf4f967b6a3f5e62641efef55 SHA-256: 9113041dbca3e1155d62b956523900a5edb1c193f932e7a407abc00daa9a821d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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
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://accessiblevehicleservices.com/userfiles/file/pubemaxejelajiw.pdf In PDF document text
- https://debo-fit.be/userfiles/file///68125858777.pdfIn PDF document text
- https://artasedanasingaraja.com/uploadfck/file/gofuwamiduxevaxuzasode.pdfIn PDF document text
- http://rajskiewakacje.pl/userfiles/file/41974679032.pdfIn PDF document text
- http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614949f8bfce4---vofis.pdfIn PDF document text
- http://pate4me.com/userfiles/file/vemag.pdfIn PDF document text
- http://danieldesignpro.com/userfiles/140892763.pdfIn PDF document text
- http://aumnat2car.com/ckfinder/core/connector/php/upload/files/58031936409.pdfIn PDF document text
- http://rexant.by/upload/editor/files/nogotebonef.pdfIn PDF document text
- https://astoraccessories.com/uploads/ckfinder/files/vuzejawetunugekidin.pdfIn PDF document text
- http://musorcentrum.around.hu/files/article/file/fumatofogodop.pdfIn PDF document text
- http://xageunion.com/userfiles/file/sokimanajaxikurewalojipit.pdfIn PDF document text
- http://netisiletisim.com/guvennet/resimlerfiles/lazekosawiloxo.pdfIn PDF document text
- https://xn--90ah6akb9e.xn--p1ai/f/file/72715892385.pdfIn PDF document text
- http://hotspot-usa.com/js/upload/files/wojawor.pdfIn PDF document text
- http://haitrungkim.vn/uploads/userfiles/file/pukoj.pdfIn PDF document text
- https://marlschuz.com/userfiles/files/zadapojiropavonovipu.pdfIn PDF document text
- http://archiw.bibliotekalesmierz.eu/img/upload/files/26183532760.pdfIn PDF document text
- http://career-id.org/ckfinder/userfiles/files/bajukuduvipanezafuxeg.pdfIn PDF document text
- https://bienenaktuell.com/sites/bienenaktuell.com/files/file/bijawuwikafuzove.pdfIn PDF document text
- https://marlin-shop.ru/ckfinder/userfiles/files/67713100445.pdfIn PDF document text
- http://miass.realxenon.ru/uploads/files/fegufojobivegazixosegi.pdfIn PDF document text
- http://kvbm.org/pds/userfiles/files/56854451939.pdfIn PDF document text
- http://shiokuda1.com/contents/files/guxanuserobini.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=social+and+behavioral+foundations+of+public+health+2nd+edition+pdf+freePDF 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_off0000b204.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB204	15476 bytes
SHA-256: `0533e4fe8553635cf993c51c9d2139e2ce375b3add7a11eef8fac770b9eddd78`
`font_01_sfnt_off0000d93a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD93A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000f151.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF151	11216 bytes
SHA-256: `01389508ebb6ab2261fb7c7fa01c5472999c343a285fd6280d98d15adf13d39d`

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