PDF malware analysis — malicious · afb5afc5fa089b02

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 10:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31

MD5: e7ae4d98594fb30a0c2541e4a63a02f3 SHA-1: 2d4f698b94584455b403d871778e7685b796e4c2 SHA-256: afb5afc5fa089b02bba2ce334b9364ff5ba1abc464ad516db055440a4d57cb32

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of numerous embedded URLs, many pointing to potentially compromised or malicious sites, suggests an attempt to lure the user to external resources. Crucially, the heuristic 'SE_SECURITY_BYPASS' indicates the document instructs the user to disable security software, a strong indicator of malicious intent to facilitate further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9981

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
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://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/60766178133.pdf In PDF document text
- http://galluccifaibano.com/userfiles/file/85774285926.pdfIn PDF document text
- http://www.gonouvellezelande.com/files/71376677977.pdfIn PDF document text
- https://visualmotion.nl/uploads/file/jefiwaxaxamelejurizasozig.pdfIn PDF document text
- http://greatwalledmond.com/ckfinder/userfiles/files/wuxiwalifejezis.pdfIn PDF document text
- http://stmrcstvm.com/userfiles/file/17785110875.pdfIn PDF document text
- https://tw-itemaos.com/ckfinder/userfiles/files/29440347157.pdfIn PDF document text
- http://kovospm.cz/fotky/file/9032705973.pdfIn PDF document text
- http://kythuatviet.vn/uploads/userfiles/file/2288811022.pdfIn PDF document text
- https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/tudebanibewuwiz.pdfIn PDF document text
- http://syarmarka.ru/userfiles/files/85533740421.pdfIn PDF document text
- http://www.fuchingrading.com/upload/file/21858955426.pdfIn PDF document text
- https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/gumawadixapiwu.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb8d329bf---kawivani.pdfIn PDF document text
- http://paletydozahrady.cz/ckfinder/userfiles/files/narotabaxiluxonopo.pdfIn PDF document text
- http://2990592.ru/ckfinder/userfiles/files/fivuvexazupirifu.pdfIn PDF document text
- https://lp-tracking.com/userfiles/file/mejufulugafekojokuzile.pdfIn PDF document text
- https://majubesar.org/contents/files/xejav.pdfIn PDF document text
- https://heritagecambodiatravel.com/userfiles/file/sipubiwigisibu.pdfIn PDF document text
- https://portalbime.com/UploadedFiles/New/file/91230477950.pdfIn PDF document text
- http://ajisushionline.com/uploads/files/zabikufefapameda.pdfIn PDF document text
- https://toscanafantastica.com/userfiles/file/66957328728.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=no+1+app+lock+for+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_off0000d831.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD831	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f048.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF048	10336 bytes
SHA-256: `58029b71758349d23e6aa9ca4e23d2a0ca351981661feb63dc6d0783fad42b29`
`font_02_sfnt_off000107ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x107AE	17188 bytes
SHA-256: `2d14add9e6b964dd67509bcf9198b95d3749d3e9d140b1e974284a6a0e51c84c`

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