PDF malware analysis — malicious · 104664d39b7118d9

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 08:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 8b6ea74d7594b42887c448af9e3f728d SHA-1: 102834cb3114b0159268f6b3fd6012e46de66f22 SHA-256: 104664d39b7118d9a8e4e92a177eb4e5f1298a093ae7492ecde140114f7cc4cc

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 within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, likely to distribute malware disguised as software downloads. The presence of numerous external URIs, many pointing to PDF files, further supports this. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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=road+rash+free+download+for+windows+7 PDF link annotation
- http://suphammamnon.org/uploads/files/74572663055.pdfIn PDF document text
- http://fotografoenricogiampieri.it/userfiles/files/73960623064.pdfIn PDF document text
- https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/doregedarik.pdfIn PDF document text
- https://megacook.pt/site/upload/file/73501428588.pdfIn PDF document text
- http://ghinelliarchitettura.it/userfiles/files/gibogizijegalabokusetiz.pdfIn PDF document text
- http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7e23ec88---munugalodavodezun.pdfIn PDF document text
- http://fioredda.com/userfiles/files/dotorogagupagiwopajedibi.pdfIn PDF document text
- https://myclubowners.travelenvogue.com/userfiles/files/musajuluxiki.pdfIn PDF document text
- http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenivaxijap.pdfIn PDF document text
- http://machinegroup.ru/img/outer/files/xebaragejadufifojebobago.pdfIn PDF document text
- https://mikludava.lt/images/files/tojuz.pdfIn PDF document text
- https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e5f0eb45---13846637045.pdfIn PDF document text
- http://escuelasfutbol8.com/docs/files/95254986484.pdfIn PDF document text
- https://forumsevens.com/images/file/68710471469.pdfIn PDF document text
- https://marikakozmetika.hu/editor_up/57190187301.pdfIn PDF document text
- http://21cedu.com/pds/userfiles/files/sitozozurej.pdfIn PDF document text
- https://bitree.ru/ckfinder/userfiles/files/42439293233.pdfIn PDF document text
- https://nirmalujjwal.com/public/ckfinder/userfiles/files/xefilemexapivafozelef.pdfIn PDF document text
- http://ourconn.com/userfiles/file/202109030441317600.pdfIn PDF document text
- http://mwbright.com/upload_fck/file/2021-9-19/20210919082255951186.pdfIn PDF document text
- https://dorfadvertising.com/ckfinder/userfiles/files/gibiredupumapamuwaxid.pdfIn PDF document text
- http://pantipplaza.com/userfiles/file/91581986718.pdfIn PDF document text
- http://motoren-adachi.com/js/upload/files/84974927050.pdfIn PDF document text
- https://aildf.in/userfiles/file/24913705531.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_off0000df08.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF08	16484 bytes
SHA-256: `c3b96d640874a1e7ea5cf19c3dbff10cf36e02e91ddb7cc01dbf5748418ec1f6`
`font_01_sfnt_off00010953.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10953	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001216a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1216A	10536 bytes
SHA-256: `e05a7bd20c37f9fa9d89409ed884fc69f125a7cb90ce2f7ceb0855a86babef0d`

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