PDF malware analysis — malicious · 2e963794a1f2ce28

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 05:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: 080ca39f855c5b1fe2a5b6a7a84fc491 SHA-1: 7331b53681a07f81f432b39dd0f1810b424d6562 SHA-256: 2e963794a1f2ce28fc0af41b8612d3c86fc466ef161eb79b55d5803d2d1f8f35

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

Nyx PDF Classifier malicious score 0.9948

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 https://krisoc.ru/uplcv?utm_term=avatar+the+last+airbender+free+watch+online PDF link annotation
- http://patrick-vallot.com/upload/files/naxet.pdfIn PDF document text
- https://www.channeloflove.com/ckfinder/userfiles/files/pamibivaxojut.pdfIn PDF document text
- http://alburigiott.it/userfiles/files/motusokazegizajaxobiwaluk.pdfIn PDF document text
- http://dansecyr.ca/pdf/file/bizutejewoxoluvifalobegik.pdfIn PDF document text
- https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4733771cb0a2208463a2ecf67894b1d7/lolasetigotiroxuwamase.pdfIn PDF document text
- https://www.nvsrolko.org/ckfinder/userfiles/files/82004573216.pdfIn PDF document text
- http://emke.hu/uploads/ckfinder/userfiles/files/faminunomamazalufibenagu.pdfIn PDF document text
- https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/nisozel.pdfIn PDF document text
- http://ondrejkocar.cz/img/file/vanojogoru.pdfIn PDF document text
- http://3dtechgroup.com/uploads/image/files/26318562586.pdfIn PDF document text
- http://jia-longsofa.com/uploadpic/jialong151126/files/202109052300387682.pdfIn PDF document text
- http://www.arborvitae.cz/ckfinder/userfiles/files/10016528951.pdfIn PDF document text
- http://n2nnetworks.com/files/others/36829245237.pdfIn PDF document text
- http://giteduguedesboires.com/userfiles/file/jezolitixekitexegoxu.pdfIn PDF document text
- http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda17ddc6e---fodonebuw.pdfIn PDF document text
- http://el-master.ru/userfiles/file/47823014860.pdfIn PDF document text
- http://brandorbit.in/userfiles/file/69340070114.pdfIn PDF document text
- https://henseltech.cz/userfiles/file/lonisogunubu.pdfIn PDF document text
- http://uralcomservis.ru/crn_fls/crn_files/razanerirovogude.pdfIn PDF document text
- https://angkoronetour.com/userfiles/file/sofudujil.pdfIn PDF document text
- http://monthclean.com/uploads/files/202109041853387264.pdfIn PDF document text
- http://ingegneriarossi.it/userfiles/files/43043603753.pdfIn PDF document text
- http://abpjseah.news-read.com/upload/files/gosege.pdfIn PDF document text
- http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/balifirededijis.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_off0000cac4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCAC4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e2d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE2D6	17840 bytes
SHA-256: `7e1e488bc271f58176227e4947189540508b1e64072b0873994b386cd4567276`
`font_02_sfnt_off00011135.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11135	10844 bytes
SHA-256: `118b208cfd54f284c065a4f4fbb1865299aadaa44286257b5c25a35823c2a226`

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