PDF malware analysis — malicious · 3815320b7a8ecd0b

MALICIOUS

PDF

69.6 KB Created: 2021-09-08 15:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0f33a039a2ea23c92523ea1e1718b0c2 SHA-1: fb24ec0c20661fc5389e4eeab9750efa6d86b7d1 SHA-256: 3815320b7a8ecd0baf0df01fec376a476cbfcee979b9216fe69e92a230075b76

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URIs. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to external sites, likely for phishing or malware distribution. The numerous external URIs, many on disposable domains, further support a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=hach+dr+900+manual+pdf PDF link annotation
- http://a-kamen.com/userfiles/file/jizavibafudob.pdfIn PDF document text
- https://konferencii.ru/js/ckfinder/userfiles/files/17526577756.pdfIn PDF document text
- https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613770bcc900c---mikunexonojeretewo.pdfIn PDF document text
- http://language-coach.pl/uploads/files/88656699317.pdfIn PDF document text
- http://studioguatta.it/userfiles/files/98674883534.pdfIn PDF document text
- https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/febubofigaduxe.pdfIn PDF document text
- http://poddertradingandindustries.com/userfiles/file/85314853849.pdfIn PDF document text
- http://www.mediagrand.hu/data/editorfile/mutalazomolaferepo.pdfIn PDF document text
- http://rayanchem.com/d/files/lopepuwemu.pdfIn PDF document text
- https://eagleegg5k.com/ckfinder/triplebuserfiles/file/40443099782.pdfIn PDF document text
- http://baracenter.be/userfiles/file/15705528866.pdfIn PDF document text
- http://www.sanjuktabanerjee.com/fckimages/file/gojuxijewol.pdfIn PDF document text
- http://abwalabamaave.com/uploads/files/86980625731.pdfIn PDF document text
- https://pianotuningdarwin.com/userfiles/files/pasiwasalopufozojazima.pdfIn PDF document text
- http://zs-oilfieldequip.ru/d/files/xexejevasiwewaduwitupeses.pdfIn PDF document text
- http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/89134248783.pdfIn PDF document text
- http://webinaris.training/ckfinder/userfiles/publics/files/45337651437.pdfIn PDF document text
- https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/ziwomabukimoma.pdfIn PDF document text
- http://gimhaejazz.com/fckeditor/userfiles/image/45323521928.pdfIn PDF document text
- http://robalton.es/Albums/images/file///bavinupudenat.pdfIn PDF document text
- http://ildungrice.com/fileupload/fckeditor/file/32393065212.pdfIn PDF document text
- http://mayinmaunhat.com/upload/files/4196743163.pdfIn PDF document text
- https://ww150001.linebot.net/upfile/files/20210908115759.pdfIn PDF document text
- https://pabxlg.com/userfiles/file/12830171446.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_off0000b2d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB2D7	14592 bytes
SHA-256: `8306546de19d3e5fd2d0e4a64b355991c9f625377ff1c6ff1a9bc31ca5aa2d4f`
`font_01_sfnt_off0000d719.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD719	10656 bytes
SHA-256: `2931166e070be08815a6cbf89ea519b2644db38a50974f15949474e82967ed6c`
`font_02_sfnt_off0000ef3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF3C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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