PDF malware analysis — malicious · ad4bd1b53c90befe

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 05:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: af81e2a5fd144373b5547be958bc2db8 SHA-1: 609590da7cf60c7f941ca7da7c7d5249c6462e35 SHA-256: ad4bd1b53c90befe6cf50948bf7d0acff4ad5a2f5ae0f0aae0c6be3a15e4bd40

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the presence of many distinct hosts and UTM parameters, common in phishing campaigns.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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.
QR-code redirect lure medium SE_QR_LURE

Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
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://seoulgreeter.com/userData/board/file/naxol.pdf In PDF document text
- http://www.protectakoteasia.com/ckfinder/userfiles/files/zizurefodasobonufaride.pdfIn PDF document text
- https://altaitur.com/ckfinder/userfiles/files/46399700185.pdfIn PDF document text
- http://problemconsulting.com/img/download/files/jipix.pdfIn PDF document text
- http://sieuthicayxanh.vn/webroot/img/files/64437391589.pdfIn PDF document text
- http://bandbaajabarat.com/ci/userfiles/files/kemifaradejizag.pdfIn PDF document text
- https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a41a2b931ad286b1b506f1d001c5b182/76305279788.pdfIn PDF document text
- http://funkyspa.net/ckfinder/userfiles/files/86768162632.pdfIn PDF document text
- https://matao.ro/app/webroot/files/userfiles/files/60377163669.pdfIn PDF document text
- https://techson-cctv.com/upload/file/tokekivifaxijajeron.pdfIn PDF document text
- https://psychologgia.pl/Upload/file/rasiwijusagavogom.pdfIn PDF document text
- http://dreamwith.gni.kr/ckupload/files/34136305953.pdfIn PDF document text
- http://diagcorlifescience.com/attachment/file/66480314256.pdfIn PDF document text
- https://metricgroup.it/uploads/file/32503099646.pdfIn PDF document text
- http://dr-temt.ru/images/file/moxeroketosewik.pdfIn PDF document text
- http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fff6e3d26e---27190026983.pdfIn PDF document text
- http://szyoujin.com/UploadFile/file/20210912041948224.pdfIn PDF document text
- http://spbmedaks.ru/sites/default/files/uploads/todalimipadiwogadekil.pdfIn PDF document text
- http://altadirezione-consulting.it/userfiles/files/segiko.pdfIn PDF document text
- http://artkulinaria.pl/sites/default/files/file/jijimibudifomilumuban.pdfIn PDF document text
- https://veterinarycarefoundation.org/userfiles/file/rariwu.pdfIn PDF document text
- https://ijmscr.com/ckfinder/userfiles/files/mozisipe.pdfIn PDF document text
- http://pc580.cn/upload_fck/file/2021-9-12/20210912024948101496.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=launcher+ios+14+luutinh+developerPDF 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_off0000cee5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEE5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e6f7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6F7	16320 bytes
SHA-256: `71a522e0e5ec54ca68be2b5c5542c1ab63c2378ae1e81763ddbc37973b67b8dc`
`font_02_sfnt_off0001114b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1114B	10864 bytes
SHA-256: `c13e58338de2b3ea44d6d92e95afca39ac395bb91421d756631de893a6f3bab7`

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