PDF malware analysis — malicious · 97d30a38fdfd1704

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 13:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 737e91214ad0da1da688eab9d9c224a6 SHA-1: 0a31d8ccacf159f193677bab059b31da680ecf7e SHA-256: 97d30a38fdfd17042c44f84c111982be5dae29e28259a7e555eefae7ea6745b1

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the execution of a second-stage payload via the embedded script and external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://crysiq.ru/uplcv?utm_term=iptv+kodi+android PDF link annotation
- http://cheers-gifts.com/userfiles/29640724672.pdfIn PDF document text
- http://cichanski.com/Upload/file/58815911275.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5c8301dadca079ccd9921b179ca86b09/rivinijax.pdfIn PDF document text
- http://moyamoya.center/images/hand_uploaded/files/jamazikebifut.pdfIn PDF document text
- http://ueros.fr/admin/ckfinder/userfiles/files/12883259813.pdfIn PDF document text
- http://koryosushi.com/uploads/files/vesazodapebirewepu.pdfIn PDF document text
- http://ms-domino.eu/images/file/files/piralazebesux.pdfIn PDF document text
- http://poslovniimenik.net/firme_data/files/nozorenef.pdfIn PDF document text
- https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/29967310792.pdfIn PDF document text
- http://lineshare.net/upload/files/20210916033709.pdfIn PDF document text
- http://www.atsamuihaus.com/image/upload/File/63648442209.pdfIn PDF document text
- https://aventura-agence.lu/userfiles/files/kixubabozalan.pdfIn PDF document text
- http://mtecommerce.it/public/news/file/22926397257.pdfIn PDF document text
- https://phr4u.com/files/77278515704.pdfIn PDF document text
- https://taksis.lv/taksis/userfiles/file/59398309920.pdfIn PDF document text
- http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/9070278355.pdfIn PDF document text
- http://tianlanlawyer.com/filespath/files/20210909060608.pdfIn PDF document text
- https://yp05.com/_UploadFile/Images/file/xopuwojulomal.pdfIn PDF document text
- http://getwealthythisyear.com/ckfinder/userfiles/files/nasuferejisofugekikezubib.pdfIn PDF document text
- https://rent-1.es/ckfinder/userfiles/files/71439114128.pdfIn PDF document text
- https://www.netcorp.hu/data/editorfile/gononanirusanamenifon.pdfIn PDF document text
- http://asesorgubernamental.com/images/file/96464754523.pdfIn PDF document text
- http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/jizugobepupizisev.pdfIn PDF document text
- https://emailing-online.fr/uploads/userfiles/file/32645759223.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_off0000b82d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB82D	10148 bytes
SHA-256: `daa6b3cb7052b2c933f39e2c1c0673afa3582225ebd4411b8fb84ed914d47f93`
`font_01_sfnt_off0000cef1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEF1	22460 bytes
SHA-256: `36342256aaed5861d6ac8623b4bf09288b88f230d228ba687a0ee4b989b52e3d`
`font_02_sfnt_off00010580.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10580	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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