PDF malware analysis — malicious · bc516504f162388a

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 02:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23

MD5: 14af118edfeb202d2d40ac94a02fd81f SHA-1: ffbf829dd3e01cbe93b77ae54e41dcd21f0acb0e SHA-256: bc516504f162388aae8c8af1af2118a4f039223779a262d47496d60f8af203a3

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains hosting PDF files. The heuristic 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to lure users to download and execute further payloads. The embedded JavaScript likely facilitates this process, potentially leading to the execution of a second-stage malware. The ClamAV detection further confirms its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9934

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://inwebjor.ru/uplcv?utm_term=android+ftp+server+library PDF link annotation
- http://lucidareemantenerepavimentifaidate.it/userfiles/files/zibasidowubigejibuzupob.pdfIn PDF document text
- http://medical-1669.com/userfiles/files/tijixamilitadizujaziju.pdfIn PDF document text
- http://thenikharvconsultancy.com/userfiles/file/45396787929.pdfIn PDF document text
- http://7sate.com/filespath/files/20210901230651.pdfIn PDF document text
- http://dogalakustik.com/depo/sayfaresim/file/ragepa.pdfIn PDF document text
- https://mimpidia.com/contents/files/tozan.pdfIn PDF document text
- http://cesarrodarte.com/userfiles/file/53659256008.pdfIn PDF document text
- https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8e902d852d1903b3c2e73dc734229124/38963799536.pdfIn PDF document text
- https://eric-parnes.com/ckfinder/userfiles/files/1920974923.pdfIn PDF document text
- http://aygroupmuh.com/image/files/nukijepajebejivuludizabek.pdfIn PDF document text
- http://space-edge.com/upload/files/31577210974.pdfIn PDF document text
- https://mzr-avocats.com/buddha/ckfinder/userfiles/files/3465845275.pdfIn PDF document text
- http://www.udelimpa.es/ckfinder/userfiles/files/25379936060.pdfIn PDF document text
- http://speed-r.com/js/upload/files/duxoxodawuwo.pdfIn PDF document text
- http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24240926226.pdfIn PDF document text
- http://immobilieninvestors.org/userfiles/file/76719021528.pdfIn PDF document text
- http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/70717326126.pdfIn PDF document text
- https://weboonline.com/ckfinder/userfiles/files/10343055929.pdfIn PDF document text
- https://sanidom.pl/img/file/gujilofuxataxadesulipivuz.pdfIn PDF document text
- https://detskeihriska.eu/ckfinder/userfiles/files/pusukipomutob.pdfIn PDF document text
- http://abwingstop.com/uploads/files/juniviw.pdfIn PDF document text
- http://joinsocialbubble.com/cake/beta/userfiles/file/xakatisafalox.pdfIn PDF document text
- https://barcelonacentromedico.es/files/galeria/files/47947202188.pdfIn PDF document text
- http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161460cf15d720---92227545613.pdfIn PDF document text
- http://innovad-ltd.com/userfiles/file/23764697397.pdfIn PDF document text
- https://zohopinler.com/calisma2/files/uploads/2269252565.pdfIn PDF document text
- http://alisawedding.com/upload/users/files/tederezugagogotabunoja.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_off0000c0ed.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC0ED	10792 bytes
SHA-256: `62b9374d8e01e703837c8d828e500115ecae5a65ef1cc3231b5421a66c514096`
`font_01_sfnt_off0000d9b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9B2	17232 bytes
SHA-256: `0b29367653bc8aecb792d87986ff4335d52254adb20658426d160f7469a0dcc7`
`font_02_sfnt_off000105fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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