PDF malware analysis — malicious · a2ea788949e82e3b

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 18:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 4c542c435fc0b566bc7caa83873ba863 SHA-1: b4ab6525590399c9eadacf018803693dbb9d2fbd SHA-256: a2ea788949e82e3bb3083ed288944826064068e89f12f6aaa9d516253702df2b

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or delivering malicious content.

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://krisoc.ru/uplcv?utm_term=so+such+too+enough+exercises+pdf+with+answers PDF link annotation
- https://inverpalmas.com/aym_image/files/gofon.pdfIn PDF document text
- http://cukiernia-waltar.pl/qcms/userfiles/file/tulegagezi.pdfIn PDF document text
- https://lifeteacher.tw/uploads/files/202109182215372797.pdfIn PDF document text
- http://thepnguyentran.com/media/ftp/file/49270392245.pdfIn PDF document text
- http://hightopeducation.com/cms_uploaded/file/vixifafimofozobulaxip.pdfIn PDF document text
- http://guchen.ru/d/files/xalafidoxofedujapedit.pdfIn PDF document text
- https://yukkumpulgroup2.com/contents/files/kofitoxod.pdfIn PDF document text
- http://tandprotheses.com/ckfinder/userfiles/files/81226309993.pdfIn PDF document text
- http://fluitec.fr/ressource/site-image/files/tuzidamonolufasobom.pdfIn PDF document text
- http://huthamcauquanggiap.com/upload/files/34924791003.pdfIn PDF document text
- http://wwm-quanta.com/upload/files/89197310310.pdfIn PDF document text
- https://valleyrentals.com/userfiles/file/67264387568.pdfIn PDF document text
- http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613238a2b8048---gorixoxulezazopuzololig.pdfIn PDF document text
- http://weifong.tw/fckimages/file/jokojo.pdfIn PDF document text
- http://turchifiltri.com/userfiles/files/mejowikabig.pdfIn PDF document text
- http://yaqeen-eg.com/userfiles/file/sobuzalabodo.pdfIn PDF document text
- http://virtualcharityevents.com/vce_cake/files/files/fijojagogim.pdfIn PDF document text
- http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/82463803066.pdfIn PDF document text
- http://heryeryesil.com/resimlerfiles/fediribukupoximugebebo.pdfIn PDF document text
- https://norservis.cz/files/files/20750909320.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6d5ab2c20---fibutafalibetejawozitit.pdfIn PDF document text
- https://przyklejki.pl/userfiles/nugozavadetos.pdfIn PDF document text
- http://vetportonaccio.it/userfiles/files/26521452539.pdfIn PDF document text
- https://betsin.org/userfiles/files/35429915045.pdfIn PDF document text
- http://deleeuwputten.nl/site/data/ws/files/68242327437.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_off0000d460.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD460	17940 bytes
SHA-256: `dffd3aef8e5558977f3eb4196a66df80ad4bed9aa6ba9d9250da0ece26ebc462`
`font_01_sfnt_off000102bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102BF	11216 bytes
SHA-256: `53423d29050c2f6dc35e4efc9038802570f845238071cbf75a576604605f6401`
`font_02_sfnt_off00011cdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CDC	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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