PDF malware analysis — malicious · a660dac9e8a00f28

MALICIOUS

PDF

73.1 KB Created: 2021-09-28 09:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: cfbd13d24ffb52780e55fa5cdd878269 SHA-1: 987bcfa462b01f24834c87068802a8364e262ce9 SHA-256: a660dac9e8a00f288d5da6c787229fa9b48e460d95189f42235fdd11d84f02db

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to other PDF files hosted on disposable domains, suggesting it functions as a link farm. This pattern is commonly used to distribute phishing content or further-stage malware payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9976

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 https://crewmak.ru/uplcv?utm_term=introduction+to+quantum+mechanics+3rd+solution PDF link annotation
- http://mercuresamuichaweng.com/admin/file/nufur.pdfIn PDF document text
- http://chetaomaynganhnhua.com/uploads/files/silafupexewita.pdfIn PDF document text
- http://nhahanghienminh68.com/upload/files/kibelufezet.pdfIn PDF document text
- http://thesciencenetwork.org/uploads/files/5963309618.pdfIn PDF document text
- https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/23246765098.pdfIn PDF document text
- https://rajakedua.com/contents/files/nizuzuduwarikuneli.pdfIn PDF document text
- http://architects-desk.com/uploadsfile/4235966041.pdfIn PDF document text
- http://budropol.de/Upload/file/sokiraviwonejogo.pdfIn PDF document text
- http://xn--vb0b83rba554gca.kr/page_data/file/20210925170448.pdfIn PDF document text
- http://wangnatheater.bpi.ac.th/ckfinder/userfiles/files/tamejavubuko.pdfIn PDF document text
- https://cowichanseniors.ca/userfiles/file/rudamefagedegasonuj.pdfIn PDF document text
- https://phunhai.net/upload/files/21167169331.pdfIn PDF document text
- https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bcdb87060---60149544952.pdfIn PDF document text
- http://uhorder.com/upload/files/70336589926.pdfIn PDF document text
- http://studiovalentini.eu/userfiles/files/demidawize.pdfIn PDF document text
- https://condominiovillage.com/userfiles/file/rupab.pdfIn PDF document text
- https://it-remarketing.pl/app/webroot/media/files/wixunogevukexuniv.pdfIn PDF document text
- https://asiapharma.la/files/files/2053271252.pdfIn PDF document text
- https://easy2ticket.com/upload/files/kakevubekowavajawilo.pdfIn PDF document text
- http://nasfthr.com/userfiles/file/vidoluvor.pdfIn PDF document text
- http://thienlongadv.com/upload/files/kazusowe.pdfIn PDF document text
- https://innotek.vn/uploads/news_file/24871536055.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613888934f2fe---60660007616.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_off0000b4bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB4BB	11004 bytes
SHA-256: `cc314c4daaaaf8f77a9905eb17554f09335c2be7336eaa18056ab6858ef0e378`
`font_01_sfnt_off0000cded.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDED	18580 bytes
SHA-256: `9d1c6d20dcc1c61c1e7e973c6537542748cfb41bbdf6509beb196b597957aefa`
`font_02_sfnt_off0000fe3c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE3C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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