PDF malware analysis — malicious · 7ba4c1800b4cc328

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 02:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 85d1d36910c8c2cd82275fe2c5dfab79 SHA-1: 4225f834d92b88f28f33fa224b5915b175753760 SHA-256: 7ba4c1800b4cc328d595b7f4bafdbc55d9fb79edd1f530a77daab8dbda20c213

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 hosted on 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 a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133b46c7ae72---wutusaniro.pdf In PDF document text
- http://www.hydro-tg.pro/upload/file/90726136135.pdfIn PDF document text
- http://dailycan.com/userfiles/files/zofuxabebovamemobizivule.pdfIn PDF document text
- https://maintogelonline2.com/contents/files/87197607194.pdfIn PDF document text
- https://fptica.ru/images/file/79152731170.pdfIn PDF document text
- http://goldenagegroup.vip/userfiles/file/sumexenizubojuvo.pdfIn PDF document text
- http://grupopiscis.com/upload/files/30803786603.pdfIn PDF document text
- https://cafeau1ait.xyz/js/ckfinder/userfiles/files/74447216161.pdfIn PDF document text
- http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161360b2d17f93---31507445266.pdfIn PDF document text
- https://goodline.by/userfiles/file/golulawivim.pdfIn PDF document text
- http://tmkb.org.tr/ckfinder/userfiles/files/13726264542.pdfIn PDF document text
- https://adesso-moosburg.de/images/file/nuzowib.pdfIn PDF document text
- http://rayanchem.com/d/files/84350985766.pdfIn PDF document text
- http://stressmanagement-karriere.de/userfiles/file/60535191859.pdfIn PDF document text
- http://solarissoft.com/img/userfiles/files/nidevofidufomesowexajeju.pdfIn PDF document text
- http://arcenevents.nl/site/upload/files/45695765751.pdfIn PDF document text
- http://tcgardening.com/userfiles/file/2021090200181873499.pdfIn PDF document text
- http://iviltra.lt/images/files/ninofadozadalazasim.pdfIn PDF document text
- https://jagamimpi.info/contents/files/33535648687.pdfIn PDF document text
- http://jiin-torng.com/uploadfiles/20210905095743.pdfIn PDF document text
- http://immobilieninvestors.net/userfiles/file/xavukaba.pdfIn PDF document text
- http://sh-ruiyangcpa.com/userfiles/file/2021-9///2021941243511341.pdfIn PDF document text
- http://jessie.vn/images/ckeditor/files/38374206752.pdfIn PDF document text
- https://barrier.exma.cl/ckfinder/userfiles/files/disugurojerumewetobuwi.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=swift+streamz+tv+apk+downloadPDF 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_off0000d85a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD85A	11040 bytes
SHA-256: `550f38a48999f96ede46fe8a79b2b4a089ece07ae828ffffb164e85a8dd2fe61`
`font_01_sfnt_off0000f218.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF218	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010a2a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A2A	17504 bytes
SHA-256: `da5acf8984e3cf534e9051e664f4e26712608552572b85e3c4aefb3bf1f7ac1f`

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