PDF malware analysis — malicious · 5a5bfa0a6c348618

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 12:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 4bb847e5a28a57cd23587119cce19f3f SHA-1: aa92793c1ccdfee2898d323a46456b844cd8c58f SHA-256: 5a5bfa0a6c3486182db53c839ade866654c748cfe3a5672b865e4f4c549e0dad

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which host PDF files. While no scripts were directly extracted, the presence of embedded URLs and the link farm behavior suggests an intent to redirect users to malicious content or phishing sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
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://irodaszer.lukinserv.hu/file/5243695475.pdf In PDF document text
- http://canadanur.com/resimler/files/donamosokokidaz.pdfIn PDF document text
- https://naucharts.com/ckfinder/userfiles/files/95137038895.pdfIn PDF document text
- https://brincandoeaprendendo.com/fotosempresa/files/76453557215.pdfIn PDF document text
- http://tikatalog.sk/_files/file/sixogilojizizaxuxo.pdfIn PDF document text
- http://rqconsultores.com/userfiles/file/kojurapuxatidoriluwokas.pdfIn PDF document text
- http://shengyaweb.com/uploadfile/file/2021091802432240.pdfIn PDF document text
- https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/11540056586.pdfIn PDF document text
- https://santa.sg/images/users/00000000/files/rarulexizuveruravowego.pdfIn PDF document text
- http://sccsfz.org/upload/2021-09/84682174939.pdfIn PDF document text
- https://intekcanada.com/ckfinder/userfiles/files/43562837394.pdfIn PDF document text
- https://xn--z4qq44i.tw/upload/actfiles/sokekikuwunijuzanusimosu.pdfIn PDF document text
- https://aiwcecckolkata.org/FCKeditor/file/rivesesikidejirumef.pdfIn PDF document text
- http://arhive.np-sp.ru/img/file/fubanovagogupesofiwe.pdfIn PDF document text
- http://planet-for-events.de/userfiles/file/45850303340.pdfIn PDF document text
- https://dalnoboy.com/data/filestorage/upload/files/68735673782.pdfIn PDF document text
- http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142405b874b6---40806212787.pdfIn PDF document text
- https://haltia.mx/sii/ckfinder/userfiles/files/tikafu.pdfIn PDF document text
- http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142716dd5b6d---somuzipexokutetil.pdfIn PDF document text
- http://dsraxys.com/uploads/vatilaxuwuzelujunejufupi.pdfIn PDF document text
- http://shijijiaming.cn/filespath/files/20210904031209.pdfIn PDF document text
- http://identik.hu/editor_up/36947172659.pdfIn PDF document text
- http://apicn.net/upload/files/78832511599.pdfIn PDF document text
- http://richmore.kr/uploadfile/fckeditor/file/37896104214.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=unicorn+dash+mod+apkPDF 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_off0000d046.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD046	10600 bytes
SHA-256: `97f18a5d40072963de9e579bb036e3352f1f3a0bc2530f379df4716cbb4f31e6`
`font_01_sfnt_off0000e83c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE83C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001004e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1004E	17692 bytes
SHA-256: `c34130d7cdce8280f90bb97bed9e3f4d5ec4870c990abd253112e1f08fbdc120`

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