PDF malware analysis — malicious · 2e4fd57a403d07d2

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 05:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24

MD5: d3c94dc33d1af0b9f34a33d50050330d SHA-1: 7a1dd5d7351313d175e44e5b2538c9c142188105 SHA-256: 2e4fd57a403d07d25707db32e628bf9c1410d9e96aaf1b1bb30c43f46b3fc723

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document containing embedded JavaScript and numerous external URIs. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to redirect the user to one of the listed malicious URLs.

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 https://inwebjor.ru/uplcv?utm_term=install+among+us+pc PDF link annotation
- https://encoyun.com/calisma2/files/uploads/mixagijuwumekefoxofotusu.pdfIn PDF document text
- https://landtop.com/filespath/files/20210914135524.pdfIn PDF document text
- https://fuoriscena.eu/file/18977171598.pdfIn PDF document text
- http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614625a8d658c---vuxaburutupigin.pdfIn PDF document text
- http://4seasonstours.in/userfiles/file/41445798468.pdfIn PDF document text
- https://bodegoncriollo.com/userfiles/file/toladogid.pdfIn PDF document text
- http://skrutit-probeg.ru/upload_picture/file/xagexumesixefuga.pdfIn PDF document text
- http://chiari-web.com/ckfinder/optimist/files/2655457734.pdfIn PDF document text
- http://platypusspot.org/uploads/ckfinder/userfiles/files/josugotigupibanedenekefes.pdfIn PDF document text
- http://innova-perila.ru/upload/files/gomibasojunuwikowenebor.pdfIn PDF document text
- http://jamxmpharmatech.com/upload/files/80592893598.pdfIn PDF document text
- http://mondoacquapiscine.com/userfiles/files/ropevuso.pdfIn PDF document text
- http://lukoilmarine.com/ckfinder/userfiles/files/tunatidirapekef.pdfIn PDF document text
- https://specializedfacilitymgt.com/public_html/userfiles/file/14031487566.pdfIn PDF document text
- http://maychamsocda.vn/images/userfiles/file/wotirifix.pdfIn PDF document text
- https://infrastone.com/userfiles/files/xulodovipuk.pdfIn PDF document text
- http://philboyd.com/19456813224.pdfIn PDF document text
- http://volkshilfe-vlbg.at/images/content/files/puxevegisijifekaxamumi.pdfIn PDF document text
- https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h02l5ujcph61khv40r4uivopl6/lepelagojonakabi.pdfIn PDF document text
- http://fireprovietnam.net/luutru/files/jewuzakanejuneripisivosex.pdfIn PDF document text
- http://topoint.cc/userfiles/fckFile/20210922170316.pdfIn PDF document text
- http://nhakhoasaigonkimcuong.com/uploads/images/files/najomoditizeromi.pdfIn PDF document text
- http://dealershop.es/userfiles/file/25034049112.pdfIn PDF document text
- http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/4831766303.pdfIn PDF document text
- https://apskarota.org/userfiles/file/gisufawuf.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_off0000b4b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4B1	10444 bytes
SHA-256: `e09dcd94b908439ec29f5b2ef0752146f2e2d6c4a4cdbd9504027e822cfdf939`
`font_01_sfnt_off0000cc6f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC6F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e481.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE481	15152 bytes
SHA-256: `759456c48b2669e8ef463e2faf19ef961156d26e9d8e6cf8e41fd7525650f1e3`

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