PDF malware analysis — malicious · 0bc86a712767495f

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 14:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: fa46b00c7f89299419e069c6c3e9318b SHA-1: 9e88c3bc374fd288977705a40dea15cf537b324f SHA-256: 0bc86a712767495f331fba738cb5223f4b7bf1679ce5cca33db6ee779cdb2049

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=linear+algebra+5th+edition+friedberg+solutions PDF link annotation
- http://acmemask.com/upfiles/editor/files/wifaverofuwor.pdfIn PDF document text
- https://bedandbreakfastholten.nl/userfiles/file/49851856297.pdfIn PDF document text
- http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pozedi.pdfIn PDF document text
- https://www.alapan.org/fckimages/file/gadugilopefipewirubotij.pdfIn PDF document text
- http://eschool365.in/js/admin/uploadfiles/file/97559477796.pdfIn PDF document text
- http://bioident.pl/photos_fck/file/penixoma.pdfIn PDF document text
- https://pui-vital.ro/msg_media/file/45563403969.pdfIn PDF document text
- https://newdesert.pl/userfiles/file/modejuxifuxozewe.pdfIn PDF document text
- http://kagoshimakojintaxi.com/userfiles/file/rarowizuduradazed.pdfIn PDF document text
- https://aglogistics-bo.net/userfiles/file/kifidafulamixov.pdfIn PDF document text
- http://childconnect.com/swi/fckfiles/file/sasaxitomup.pdfIn PDF document text
- https://bibonatura.hu/ckfinder/userfiles/files/11174698741.pdfIn PDF document text
- http://paradisetourkorea.com/FileData/ckfinder/files/20210906_112EC916BF640548.pdfIn PDF document text
- https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/fevekakonulogisafape.pdfIn PDF document text
- http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613269e839cf5---lusiluvalajidowejuvot.pdfIn PDF document text
- http://changjiujz.com/uploads/files/202109070201029104.pdfIn PDF document text
- http://igs.compcierge-asia.com/ckfinder/userfiles/files/29348704268.pdfIn PDF document text
- http://wideanglepackaging.com/ckfinder/userfiles/files/42517533081.pdfIn PDF document text
- http://thesei.com/In PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161390578cd5a2---kowezuzi.pdfIn PDF document text
- http://vangphutai.com/images/uploads/files/botus.pdfIn PDF document text
- http://infrabud.eu/fckpliki/file/vozutodifepurutesijidepiz.pdfIn PDF document text
- http://potlista.com/file/files/97052447807.pdfIn PDF document text
- http://tes-sys.com/uploads/ckfinder/files/20210911/16313616506557.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_off0000c6f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6F4	18920 bytes
SHA-256: `e19fd6675ebf0235f1a2f56f8737ed9e9c71e23d45ca7c51f13abb933674a318`
`font_01_sfnt_off0000f74a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF74A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010f61.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F61	10964 bytes
SHA-256: `8f22f491fac84204512a90442e47b0b585146034f5127fc32c9f13c4d60c67ce`

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