PDF malware analysis — malicious · c82faf941c21cda9

MALICIOUS

PDF

77.5 KB Created: 2021-09-25 06:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 131948e1d419f02a82664c012e33de26 SHA-1: 2439c0e2738b781e46f10d5f4b913dd0f78ec674 SHA-256: c82faf941c21cda9b738396cf060dae4aeeb7656093a5bcf81ae5e194a303647

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to disposable or suspicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9962

Heuristics 5

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.
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://testpensija.bankai.lv/ckfinder/userfiles/files/lodanidizudobi.pdf In PDF document text
- http://exosushi.com/uploads/files/jowuwipibokumimalajuwun.pdfIn PDF document text
- http://francescasciortino.it/userfiles/files/54564156356.pdfIn PDF document text
- http://giovanninociti.com/userfiles/files/zirinepazubir.pdfIn PDF document text
- https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148785d65f0f---50119548521.pdfIn PDF document text
- http://flathead.herosuite.com/userfiles/file/41322321585.pdfIn PDF document text
- https://nffcd.org/userfiles/files/lemuvixavorivakijutiwago.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d25f542fb8---gilawefosoninofiporisegum.pdfIn PDF document text
- https://easternresources.net/ckfinder/userfiles/files/dajorusekunaso.pdfIn PDF document text
- http://pajurioverslas.lt/ckfinder/userfiles/files/1303452784.pdfIn PDF document text
- http://stacjaregeneracja.pl/userfiles/file/79485009088.pdfIn PDF document text
- https://quangcaowebsitecomvn.xemlaco.com/uploads/files/59702490996.pdfIn PDF document text
- http://oroblupiscine.it/userfiles/files/59188738451.pdfIn PDF document text
- https://anjingliar2.com/contents/files/78224202530.pdfIn PDF document text
- https://lompatjauh.com/contents/files/zimixatevenifosulasobigi.pdfIn PDF document text
- https://zhongzing.com/uploads/files/202109201457277249.pdfIn PDF document text
- http://mottaing.eu/userfiles/files/lidakadoxomudufabugigef.pdfIn PDF document text
- http://jmdfhjl.com/fckeditor/userimages/file/38483967896.pdfIn PDF document text
- http://hoaisonland.vn/upload/files/41027559447.pdfIn PDF document text
- http://whuntex.info/userfiles/file/zatoluzosazu.pdfIn PDF document text
- http://fisioterapiasuzzara.it/userfiles/files/14964855951.pdfIn PDF document text
- http://www.pro9apps.com/app/webroot/files/uploadimagesfile/fimamalanosoko.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=hearthstone+crashing+iosPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b3ef.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB3EF	16264 bytes
SHA-256: `663f3d71bcb6fb8d32835e3a3bc2391771ce99e8ea99821764163c37604c9400`
`font_01_sfnt_off0000c9ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9EE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000e205.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE205	10456 bytes
SHA-256: `37d14fe78e6b118eea604c93564eebfbfc3451d1bebdfd29bfe3174606e4cdac`
`font_03_sfnt_off0000f9ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF9AE	17876 bytes
SHA-256: `f20d1097ca49cd9d6cd819bc4438838a9d68e5935cc5d8bf09bd9e8f0c07e8aa`

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