PDF malware analysis — malicious · 9a164d85effe64d9

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 12:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: fd53500e11171c3f59548b984fe0a303 SHA-1: c518e8c66254abe756c4200c3b13900cbb7ee8b4 SHA-256: 9a164d85effe64d940a8cf7c6fe00aa1a3a1ca67cd0267595d5acaf31880b6ef

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing campaign. The presence of embedded JavaScript further supports malicious activity, potentially for exploiting vulnerabilities or redirecting users.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 7

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.
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
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://oniceh.ru/uplcv?utm_term=pokemon+x+hacks+3ds PDF link annotation
- http://thebrownbag.vn/upload/files/51467882366.pdfIn PDF document text
- http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b838c62dc2---63929279508.pdfIn PDF document text
- http://evevoyance.fr/adh/.-/file/76749499217.pdfIn PDF document text
- http://styrexon.cz/userfiles/file/25213732021.pdfIn PDF document text
- https://majubesar.com/contents/files/99424006797.pdfIn PDF document text
- https://mimpisiluman.com/contents/files/95148544847.pdfIn PDF document text
- https://berbagiangka.com/contents/files/fibokalawiraxozuxed.pdfIn PDF document text
- http://fskyok.com/uploadfile/files/26445939840.pdfIn PDF document text
- https://transturist.ba/ckeditor/ckfinder/files/files/wikomu.pdfIn PDF document text
- http://bukvoznaika.ru/ckfinder/userfiles/files/74539435577.pdfIn PDF document text
- http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/maravisefed.pdfIn PDF document text
- https://mimpiindahsatu.com/contents/files/jotirewop.pdfIn PDF document text
- https://ozora.schaffsen.com/contents/file/bozunoselowozuraruvapun.pdfIn PDF document text
- https://www.privathospitaletkollund.com/ckfinder/userfiles/files/28739898013.pdfIn PDF document text
- http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/bubokogogenupapadaweti.pdfIn PDF document text
- https://rlmahtani.com/userfiles/files/11163720844.pdfIn PDF document text
- https://go2germany.ru/files/file/99765764373.pdfIn PDF document text
- http://talk200.com/admin/admin/uploadfiles/file/99359928803.pdfIn PDF document text
- http://hfengly.dk/skoleportalen/userfiles/file/wibamipufejawoni.pdfIn PDF document text
- https://loyalangkorapartment.com/userfiles/file/18343261962.pdfIn PDF document text
- http://insuralead.com/userfiles/file/91739856577.pdfIn PDF document text
- https://codefon.hu/js/ckfinder/userfiles/files/xugoje.pdfIn PDF document text
- https://alebusph.centralcms.cloud/galeria/files/20613650324.pdfIn PDF document text
- http://bdn10.cz/files/file/42322494551.pdfIn PDF document text
- https://rjpexport.com/files/31110250978.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_off0000da51.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA51	10664 bytes
SHA-256: `281a5a60706bcc67a5308d340794ffb999797952ec1cf8a58baa5b0cefc541f3`
`font_01_sfnt_off0000f29c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF29C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00010aae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AAE	18392 bytes
SHA-256: `6a6ea48ec9cd0c46526472d0c314b1aebd9192edacc2aaf3ccd3d1978113a469`

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