PDF malware analysis — malicious · 028242b54d7235bb

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 15:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: d3383fb3505c2307720fdcef6f3912a3 SHA-1: cc506ce242f3c053112c56669c5fc4e918f1dd9f SHA-256: 028242b54d7235bb487d35bf19d41ecaf835a32a71b192b7a10f89c7d562bcb4

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded JavaScript and the large number of external links suggest a phishing or link-farming operation. The sample's primary function appears to be redirecting users to potentially malicious websites, as evidenced by the numerous unknown-reputation URLs.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=six+sigma+project+pdf PDF link annotation
- https://tasleemdubai.com/userfiles/files/91858515422.pdfIn PDF document text
- https://cyberbirddog.com/userfiles/files/98597991053.pdfIn PDF document text
- http://vattuxaydunghl.com/userfiles/file/56234965488.pdfIn PDF document text
- https://sibservis.com/ckfinder/userfiles/files/xixigezoseliwepime.pdfIn PDF document text
- http://agriturismolataggiasca.eu/userfiles/files/16558589099.pdfIn PDF document text
- http://langeline.com/ckeditor/upload/files/7629736922.pdfIn PDF document text
- http://otpetye.com/images/shared/file/39069327575.pdfIn PDF document text
- http://www.urbanwaterways.info/files/bemuletusarati.pdfIn PDF document text
- https://viveironativodevicosa.com.br/ckfinder/userfiles/files/41225888028.pdfIn PDF document text
- http://circolosilverblufitnessclub.eu/userfiles/files/25533989752.pdfIn PDF document text
- http://lnaixi.com/userfiles/file/20210919034330_1251629287.pdfIn PDF document text
- http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135025447233---mejonulebuwopa.pdfIn PDF document text
- http://dspec-car.com/js/upload/files/kekadatudiralirukutifogo.pdfIn PDF document text
- https://kamwalibais.com/userfiles/file/viwotopagubejenaloxetese.pdfIn PDF document text
- http://gyuco.com/uploadfile/files/20210911_000032.pdfIn PDF document text
- http://evaemlak.com/userfiles/file///lixirekukesapimesaropi.pdfIn PDF document text
- http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/xoredegubelonivagonadan.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e1702f277b5da2b530c336d80bbc64ad/wenimogiva.pdfIn PDF document text
- http://pharmorgsyn.com/upload/files/77620066986.pdfIn PDF document text
- http://thepokeluau.com/uploads/files/pimozebebeb.pdfIn PDF document text
- http://www.naturhalles.fr/fckeditor/userfiles/file/94042773982.pdfIn PDF document text
- http://cobansut.com/userfiles/file/82986490910.pdfIn PDF document text
- https://rpdev.org/ckfinder/userfiles/files/41615928701.pdfIn PDF document text
- https://southernwashpros.com/nbloom/fckuploads/file/jumubavoridugafa.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_off0000e051.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE051	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f868.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF868	11120 bytes
SHA-256: `000ce443b92bf3fa7722cd208cae2653df4b4bc5df990dce2bbecd21fe3861ba`
`font_02_sfnt_off0001122a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1122A	19064 bytes
SHA-256: `c39fb4bcb14493740154eb332a82b0a19edffb8abedabb74fa6e4e139a6cdd4b`

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