PDF malware analysis — malicious · 2479754f24293521

MALICIOUS

PDF

76.8 KB Created: 2021-09-11 16:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 7d4ef092f6561b3b06cddd94bbe4fee9 SHA-1: 27934ee00ce97389870cc1c9aa6b2408d1c74ade SHA-256: 2479754f24293521df321e91ac090cde4b74a6b9b0c6fdffc0981ccf7766d7d6

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it's likely used as a lure to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm strategy, common in phishing campaigns.

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 http://www.pilartangguh.com/file/xajezesefaperap.pdf In PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a912ce954---63454740811.pdfIn PDF document text
- http://engineersclasses4competition.com/files/others/33910157994.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/files/sitidugevi.pdfIn PDF document text
- http://es-manzokudou.com/yamituki-n/uploads/files/fubosagaxogaru.pdfIn PDF document text
- http://dynamicyunnan.com/ckfinder/userfiles/files/suselufuvubegugo.pdfIn PDF document text
- http://utuin.net/files/fckeditor/file/gizisozoxumemuzonibujuw.pdfIn PDF document text
- http://optikametuje.cz/userfiles/file/83466075702.pdfIn PDF document text
- http://flemingdecal.com/uploads/assets/file/galodarig.pdfIn PDF document text
- http://bright-inter.com/file_media/file_image/file/4187712193.pdfIn PDF document text
- http://bugskin.org/userfiles/file/75928043726.pdfIn PDF document text
- https://www.willmarareachamber.com/ckfinder/userfiles/files/dozutitukojixugujopa.pdfIn PDF document text
- https://greenline.bg/userfiles/file/xasikifemumuru.pdfIn PDF document text
- http://aytekinpolatel.com/image/files/nafotamozisivinibemusasuv.pdfIn PDF document text
- https://ifbscalidad.eus/files/galeria/files/42648153180.pdfIn PDF document text
- http://soloparamideco.com/js/new/fckeditor/userfiles/file/wutopuba.pdfIn PDF document text
- http://globalsublimation.net/uploadfile/files/jajopuluramemoregate.pdfIn PDF document text
- https://jatransfer.com/userfiles/file/246147924.pdfIn PDF document text
- http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161344ba5a7236---76405983939.pdfIn PDF document text
- http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/belanikas.pdfIn PDF document text
- http://kiko168.com/UploadFile/file/20210904124758872.pdfIn PDF document text
- http://hongshengfish.com/uploadfiles/2021090504081867224.pdfIn PDF document text
- https://giorgiosantinelli.it/file/mofozujaligebotebitasi.pdfIn PDF document text
- https://highrise.pl/file/wimofixozinewin.pdfIn PDF document text
- http://linker-apps.com/files/bevep.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=new+top+gun+trailer+2PDF link annotation
- 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_off0000ca3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA3E	16584 bytes
SHA-256: `f4a9ccd560ecdd9e525a1316c6e854046021b16e7306789b8ac963be424489b7`
`font_01_sfnt_off0000f556.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF556	10544 bytes
SHA-256: `86415362f90324c450a2506f2f2e779f918157d77f94e13d9d0c64b8868a7fce`
`font_02_sfnt_off00010d96.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D96	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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