PDF malware analysis — malicious · 5b7a3a751d3d5f13

MALICIOUS

PDF

74.5 KB Created: 2021-09-29 00:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: e88d4de65401e2305762aed5d798b51a SHA-1: 4a8e0fde6aa20f876f7baca0f0ff9cb2737eb814 SHA-256: 5b7a3a751d3d5f137bb053a5d7ebe3875efb50ed1316756d4ecb822c2726b55d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external URLs, many of which are hosted on potentially disposable domains and configured as link farms, suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/63586071665.pdf In PDF document text
- http://enslev-anlaegsservice.dk/userfiles/file/kununutabu.pdfIn PDF document text
- https://hanoihome.net/img_duhoc/files/bitixa.pdfIn PDF document text
- https://yellowmangocafe.com/userfiles/file/sawaduvavadetijofoz.pdfIn PDF document text
- http://gpkoaee.ru/ckfinder/userfiles/files/88656874858.pdfIn PDF document text
- http://el-system.jp/uploads/2012/files/xelasavujepebiminubef.pdfIn PDF document text
- http://studiotecnicostradi.eu/userfiles/files/32468954698.pdfIn PDF document text
- http://mp-journal.com/media/file/65550640216.pdfIn PDF document text
- http://savitaco.com/uploads/images/files/14082654019.pdfIn PDF document text
- http://apnm.indexint.net/ckfinder/userfiles/files/sewetakalumamapinijigem.pdfIn PDF document text
- http://giovanniseneca.eu/userfiles/files/zidejivatuzitetosotope.pdfIn PDF document text
- https://copacndg.com/images/uploads/files/81037023140.pdfIn PDF document text
- https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/64a3d8de0c4793d429f78c59120f8141/gixam.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0f345849992e9eb77f28dc15b03ead25/80989773787.pdfIn PDF document text
- https://eventaipei.com/upload/files/29631487821.pdfIn PDF document text
- https://dakhoathienhoa.net/images/files/fakipupevexida.pdfIn PDF document text
- https://konferencii.ru/js/ckfinder/userfiles/files/69847249946.pdfIn PDF document text
- http://wskinbody.com/data/boardData/files/63302648216.pdfIn PDF document text
- http://mrs724.ir/basefile/drtiketcom/files/jixemuro.pdfIn PDF document text
- https://hanomanberjaya.com/contents/files/37468025974.pdfIn PDF document text
- https://trouver-une-ssii.com/img/pics/files/rupavigewiduvevo.pdfIn PDF document text
- https://inprovitbrasil.com/ckfinder/userfiles/files/90991253881.pdfIn PDF document text
- http://csp.hu/editor_up/tarexerupu.pdfIn PDF document text
- http://ephtour.com/FileData/ckfinder/files/20210914_D6E414D218C24C12.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=regresion+y+correlacion+pdfPDF 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_off0000bada.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBADA	10856 bytes
SHA-256: `b95f24a53cf9d5178e03525716c2944ef912a7147f6ed8b560856f45b4866d3a`
`font_01_sfnt_off0000d3d2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD3D2	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ebe4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBE4	18732 bytes
SHA-256: `f5e1f68b8dcc59ef50ad917fc2bf4e3829ee456fd788566d646ffc399e2b8b30`

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