PDF malware analysis — malicious · f62a9ac8f7b74984

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 01:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 7f9a0572d8abc167031c5d02153f9c19 SHA-1: a15dc029747d4f87615f13a5478dfda5e3809742 SHA-256: f62a9ac8f7b74984f19800468858215a86e8d8b00c4baa4941fd8cbff936bff1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of a second-stage payload via the embedded JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://wadsoda.com/UserFiles/File/27901086266.pdf In PDF document text
- http://bancasemecanino.com/userfiles/files/90309981936.pdfIn PDF document text
- http://giga.sk/storage/file/guvalexanizupebu.pdfIn PDF document text
- http://domgr11.ru/uploads/files/vuviveralefixegobitiduxub.pdfIn PDF document text
- http://formpart.com/upload/ckfinder/files/24559129239.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/5da541f15c8681f9d253ed04a92d9227/35883317972.pdfIn PDF document text
- http://st03.it/userfiles/files/vuwipelipetojosuk.pdfIn PDF document text
- https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/39206cd0fa57a1231b785ee15ab6b25f/52866478953.pdfIn PDF document text
- http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/gaxosujobirixugofebetinuv.pdfIn PDF document text
- https://dzido.pl/userfiles/file/zelelafapujupinu.pdfIn PDF document text
- https://jagamimpi.org/contents/files/57895903368.pdfIn PDF document text
- https://kitchensofdiablo.com/upload/file/jivezolonemo.pdfIn PDF document text
- https://carmelocuritiba.com.br/ckfinder/userfiles/files/42852937072.pdfIn PDF document text
- http://gavionescodeinsa.com/userfiles/tesovade.pdfIn PDF document text
- http://akademibt.com/resimler/files/jumufavibexubasafimin.pdfIn PDF document text
- http://alessandrobelleseveterinario.eu/userfiles/files/vimididegaserozotujiko.pdfIn PDF document text
- https://nk-sostanj.si/files/file/32872594595.pdfIn PDF document text
- https://mlspoland.co/files/file/jojineso.pdfIn PDF document text
- http://seanmore.com/userData/board/file/96010986923.pdfIn PDF document text
- http://jingyilin.org/uploads/file/povola.pdfIn PDF document text
- https://hatinhjobs.com/upload/files/dusedigofidujesenefubosol.pdfIn PDF document text
- http://www.sloepverhuur-debiesbosch.nl/upload/files/38377137814.pdfIn PDF document text
- http://odontoflash.eu/userfiles/files/sonanofixir.pdfIn PDF document text
- http://gddfboiler.com/uploads/files/lamaxomiwut.pdfIn PDF document text
- https://rh-h1tapi-turbo.com/contents/files/91606659923.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+monitor+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_off0000b397.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB397	10176 bytes
SHA-256: `38b2b61036b9783c55376a72534cb7fe2c7434013b7a0b452c7cda4a6e4dee4e`
`font_01_sfnt_off0000ca59.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA59	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e26b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE26B	16540 bytes
SHA-256: `469111663b293d095b6cf7c2ff8c7d16d85db13491ea4c2768bc2abe6b8a1f28`

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