PDF malware analysis — malicious · 3181c747042c3ab4

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 20:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: a6cec20503933f17064f9bff0bcccb32 SHA-1: 2c760b4b2038425b5e7e3262e663c817f4a62a8c SHA-256: 3181c747042c3ab44711fd6ada7d175709413fed7acf88ad329ce2c0b5df25ad

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also hosts a large number of external URLs, many of which appear to be part of a link farm designed for SEO manipulation, suggesting a lure to disguise malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload.

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://krisoc.ru/uplcv?utm_term=how+do+i+screenshot+on+galaxy+s8 PDF link annotation
- http://studiosiciliani.eu/userfiles/files/20694651348.pdfIn PDF document text
- http://ankaraeksioglu.com/resimler/files/69561658628.pdfIn PDF document text
- http://yuha.be/_files/file/56231383479.pdfIn PDF document text
- http://knipia.com/userfiles/file/79694593048.pdfIn PDF document text
- http://efeotokiralama.com/Upload/file/45538770658.pdfIn PDF document text
- https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/1d34dfb136443c9360b8dce8ea2b7bcc/zirekakewisefipojumofafab.pdfIn PDF document text
- https://capital-publishing.com/ckfinder/userfiles/files/jibepidison.pdfIn PDF document text
- https://foodsafebox.com/ckfinder/userfiles/files/wubutotumafedomefopeni.pdfIn PDF document text
- http://www.majbrno.cz/uploads/files/revetugu.pdfIn PDF document text
- https://eagle-aviation.com/userfiles/files/nunivasujixodobisirimipa.pdfIn PDF document text
- http://china-zub.ru/userfiles/file/xijowitezowatasuzup.pdfIn PDF document text
- https://al-farh-iq.com/upload/userfiles/file/716569409.pdfIn PDF document text
- http://www.mueblesgamez.com/ckfinder/userfiles/files/57391491969.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec783924f0---zuwukuxuro.pdfIn PDF document text
- https://datatalk.ilvzhou.com/upload/files/2021/09/202109141703209708.pdfIn PDF document text
- http://air-separation-supplier.com/d/files/44140402014.pdfIn PDF document text
- https://eastmangroup.org/ckfinder/userfiles/files/54053892520.pdfIn PDF document text
- https://5ky13lu3-1251.com/contents/files/sutedavokufijovemesojava.pdfIn PDF document text
- http://aldo-ins.com/userfiles/file/23377564016.pdfIn PDF document text
- https://groupunsur3.com/contents/files/funujavizudiloliwor.pdfIn PDF document text
- http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109012341516739767unlpc.pdfIn PDF document text
- http://hangquangauto.com/files/dejupovuxapa.pdfIn PDF document text
- http://otoozevran.com/resimler/files/92070137901.pdfIn PDF document text
- http://sino-web.net/filespath/files/20210908044806.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_off0000d5da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD5DA	11152 bytes
SHA-256: `d9a010fdf4e48f5829e67adf88bc1e82cce6224f4c0d97bd915c6ac7b1e6b834`
`font_01_sfnt_off0000efae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFAE	18484 bytes
SHA-256: `9dc35187fbe2f002f54f0a11e10f7bd637e99ecb1d1fe49d188de0b8ad28ac94`
`font_02_sfnt_off00011fc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FC7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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