PDF malware analysis — malicious · f6e101bbf1952797

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 03:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: f87ca79695a90196e5001112dd6b00ed SHA-1: 206771c7cedf23265bb7956e066ab887e3ad4149 SHA-256: f6e101bbf19527971669b78f79ddf918ed1cdde503a3dcd06c3df5e4a8a3f1f3

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The PDF contains numerous external URIs, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded JavaScript (T1059.007) further supports its malicious intent, likely to facilitate further exploitation or phishing.

Machine Learning

Nyx PDF Classifier malicious score 0.9947

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://beijingxinzhi.com/userfiles/file/20210903033021_649463817.pdf In PDF document text
- https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/fonigipalabesageserokatur.pdfIn PDF document text
- https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/94644470962.pdfIn PDF document text
- http://geteffective.biz/uploadfiles/file/reduwesaja.pdfIn PDF document text
- http://lingvastar.z-i-g-z-a-g.com/userfiles/files/71654549049.pdfIn PDF document text
- https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22e98262f---vinaviwukiliwupefakojijan.pdfIn PDF document text
- https://immo-cjeanpaul.lu/userfiles/files/56783742518.pdfIn PDF document text
- http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/vosuja.pdfIn PDF document text
- http://nazycakes.com/userfiles/file/depupefirewuke.pdfIn PDF document text
- https://gruntbudowa.pl/files/file/37224898383.pdfIn PDF document text
- https://liftsystems.ro/LiftFiles/file/xunedis.pdfIn PDF document text
- http://younewstoday.com/task/userimages/file/majuweb.pdfIn PDF document text
- http://montazerangroup.com/uploader/file/xexofalatudikaki.pdfIn PDF document text
- http://computergramm.com/userfiles/file/nivatox.pdfIn PDF document text
- http://baodieptailor.com/uploads/2021-09-06/images/files/81024602090.pdfIn PDF document text
- http://www.ctnphrae.com/ckfinder/userfiles/files/96236909082.pdfIn PDF document text
- https://alistairmills.com/ckfinder/userfiles/files/xopuroze.pdfIn PDF document text
- http://minerva-collection.net/files/files/79059535166.pdfIn PDF document text
- https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25f975089---4307896159.pdfIn PDF document text
- http://rocb-ap.org/file_media/file_image/file/51975959342.pdfIn PDF document text
- http://awfiowv.love-mrt.com/upload/files/bazosefafunimiza.pdfIn PDF document text
- http://cdenito.net/userfiles/file/sowukolaguwelenak.pdfIn PDF document text
- https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/nugokukexojifoz.pdfIn PDF document text
- http://adamslakeband.org/userfiles/file/75553184688.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=texts+from+iphone+to+android+not+sendingPDF 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_off0000ec8c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC8C	18056 bytes
SHA-256: `54b3c5e478fb7319f76aae536a61291b7d81115a8a3b346f6db5c5409dc601bf`
`font_01_sfnt_off00011b9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11B9B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000133b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x133B2	10964 bytes
SHA-256: `42122173ac1720f33b6c3e882a0897093be448e7d847a798b724836f92e2a0b1`

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