PDF malware analysis — malicious · fb08fd6b72797ecc

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 15:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: c05e5869a571000122e90a607b278e65 SHA-1: d4c25b7e694b0795486d80a8449117e2972d6361 SHA-256: fb08fd6b72797eccf8fbbb8c90816fa952120c3c12c7f8b0d9c6cda5275c48a6

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are linked to disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://amsuatrust.org/survey/userfiles/files/54920647200.pdf In PDF document text
- https://xosobacninh.vn/webroot/img/files/pudulekasiziruzow.pdfIn PDF document text
- http://arniuniversity.in/ci/userfiles/files/80298428073.pdfIn PDF document text
- https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/97970189300.pdfIn PDF document text
- https://kawanmto.net/contents/files/92191875008.pdfIn PDF document text
- http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613078aceb573---68360583778.pdfIn PDF document text
- http://uniondrygoods.com/fckeditor/userfiles/file/zuwet.pdfIn PDF document text
- http://szm.hu/userfiles/file/51142272127.pdfIn PDF document text
- https://hebatkeren88.com/contents/files/vidiviwinedolofegofuzed.pdfIn PDF document text
- http://arcstema.com/userfiles/files/10933146749.pdfIn PDF document text
- https://wemservice.com/ckfinder/userfiles/files/70691346968.pdfIn PDF document text
- http://bpabv.nl/uploadfiles/file/48769585437.pdfIn PDF document text
- http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/86287300825.pdfIn PDF document text
- http://ros-grad.ru/fck_editor_files/files/fazajuvajemo.pdfIn PDF document text
- https://santa.my/images/users/00000000/files/86168940617.pdfIn PDF document text
- https://wyslijpaczki.pl/app/webroot/files/userfiles/file/82548636175.pdfIn PDF document text
- https://aprilboya.com/userfiles/file/49336175984.pdfIn PDF document text
- https://chachachat.info/js/ckfinder/userfiles/files/xawozuxapebexomaz.pdfIn PDF document text
- https://mercerapparelss.com/userfiles/files/10606735424.pdfIn PDF document text
- https://ever-progress.dacola.com/upload/files/82629692685.pdfIn PDF document text
- http://www.srijonihealinghome.com/fckimages/file/giwinakejisifuzidudit.pdfIn PDF document text
- http://champagne-marc-chauvet.com/images/files/rotezutigezenap.pdfIn PDF document text
- http://rurisnet.org/images/file/jeperezokekenurab.pdfIn PDF document text
- http://stroyindustry.com/userfiles/file/71680110228.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+sms+spamPDF 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_off0000b0e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB0E8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c8fa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC8FA	17228 bytes
SHA-256: `c105c052b6b618370311ee558d80051082ef4e85cba6eb32aec6ea4d0add7f62`
`font_02_sfnt_off0000f5a4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5A4	10260 bytes
SHA-256: `0c4d2c91118ead620dc8eba9eb32aa8269d68cc70eef316a8585a05b33a0b8a6`

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