PDF malware analysis — malicious · c3a3a828ffaa52ff

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 10:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: aa56a28b9e1d8f24be307b6348d88ed0 SHA-1: 8852b0eb2dd6ef3cfba165ce07c6ea9b9037c2a4 SHA-256: c3a3a828ffaa52ff17c20f725ef69da3a0cb36583e1025f7e9c171563346764f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, with heuristics indicating embedded JavaScript and external URIs. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown-reputation URLs. This pattern is consistent with phishing or malware distribution campaigns.

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 http://botosani.ro/img/uploads/file/dekuxolurekos.pdf In PDF document text
- http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fabagorozezixisibovez.pdfIn PDF document text
- http://zhongguohuachun.com/d/files/vurabonufumokut.pdfIn PDF document text
- http://cathugo.de/res/wysiwyg/file/gakonadevaguxoj.pdfIn PDF document text
- http://zussobrance.sk/grafika/dokumenty/notesab.pdfIn PDF document text
- https://www.southdownscellars.co.uk/ckfinder/userfiles/files/takozuxowurosekefix.pdfIn PDF document text
- https://edarky.net/data/file/jasegomabewubeke.pdfIn PDF document text
- https://jills.reviewz.eu/app/webroot/files/userfiles/files/30486935792.pdfIn PDF document text
- http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/40064035598.pdfIn PDF document text
- http://dailitara.lt/bites/uploads/file/tugebasow.pdfIn PDF document text
- http://spamsmsgiare.com/media/ftp/file/tijedoxelezoj.pdfIn PDF document text
- http://linza-market.ru/upload/files/mulugivinebososezataxaxuj.pdfIn PDF document text
- http://uran-berlin.com/userfiles/file/doxipulolotogikuruwiz.pdfIn PDF document text
- https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/93880409305.pdfIn PDF document text
- https://vaitinhdien.com/app/webroot/upload/files/wudojak.pdfIn PDF document text
- https://ice-group.pl/userfiles/file/luwedaza.pdfIn PDF document text
- http://cinebuzz.be/uploads/userfiles/files/zuxatokuvijiwogilifu.pdfIn PDF document text
- http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dfe0e2193---34473980448.pdfIn PDF document text
- http://dataction.org/demo/dataction/media/75471117285.pdfIn PDF document text
- http://jingyilin.org/uploads/file/42947448975.pdfIn PDF document text
- https://isabellepieman.com/userfiles/file/mogegu.pdfIn PDF document text
- https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc201a7e13---78996876217.pdfIn PDF document text
- http://midel.me/userfiles/file/goxidisajujigopapoloxedo.pdfIn PDF document text
- https://www.piramideidiomas.com/ckfinder/userfiles/files/70559513808.pdfIn PDF document text
- https://phunhai.net/upload/files/binopofaliletila.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hogs+of+war+androidPDF 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_off0000e159.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE159	10328 bytes
SHA-256: `7b217c57ba5c9f8deb1a390b148a8f2a76339e2f97dafa57d45b776e7b1aeb56`
`font_01_sfnt_off0000f884.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF884	18044 bytes
SHA-256: `ee9839d04859afbfb187766aacd9a7589ae5b339dd92298f45dfcd287008839d`
`font_02_sfnt_off000127ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x127AB	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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