PDF malware analysis — malicious · d812063d618ed9a2

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 08:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 44d5316ed0c6add8e1ed110a9263fd8c SHA-1: 30fb337734bfa2ff518facd8e5746d19b467a6ea SHA-256: d812063d618ed9a29f98c122789fbd13bc2e5d14947487cb22f4c6195da314e3

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs and a heuristic indicating a 'link farm on disposable hosting' strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading to credential harvesting or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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
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://nomylo.ru/uplcv?utm_term=can+you+find+wifi+password+on+android PDF link annotation
- http://www.naturhalles.fr/fckeditor/userfiles/file/38406453640.pdfIn PDF document text
- https://balajitutorial.com/admin/userfiles/file/nenujumitefitatowa.pdfIn PDF document text
- http://brunagabriele.it/userfiles/files/fipetimuv.pdfIn PDF document text
- http://flapboxes.custompackageboxes.com/userfiles/files/63601567896.pdfIn PDF document text
- https://vayamcs.com/content_files/files/55368506785.pdfIn PDF document text
- http://candientu24h.vn/webroot/img/files/7096882720.pdfIn PDF document text
- http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613897c8de5d4---8724525778.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408dd74ed78---96066863527.pdfIn PDF document text
- http://jamalcar.com/userfiles/file/41916082840.pdfIn PDF document text
- https://coastalstudio.com/images/main/file/83877176006.pdfIn PDF document text
- https://quangcaowebsitecomvn.xemlaco.com/uploads/files/tosuvamisekisurebanuxadi.pdfIn PDF document text
- http://gorisum.net/fckeditor/upload_file/file/vitip.pdfIn PDF document text
- http://hondatayho.vn/images/ckeditor/files/renirom.pdfIn PDF document text
- https://floresdeserrezuela.com/aym_image/files/fovora.pdfIn PDF document text
- https://123natura.com/stockages/files/71631283602.pdfIn PDF document text
- https://rakowka.pl/userfiles/file/98776322157.pdfIn PDF document text
- https://kimtuong.vn/isc/public/files/fckupload/file/vazarumurinipesas.pdfIn PDF document text
- http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/48205835402.pdfIn PDF document text
- http://alanaf.ru/userfiles/files/44111222051.pdfIn PDF document text
- http://anhuishangbiao.com/upload_fck/file/2021-9-14/20210914172354148397.pdfIn PDF document text
- http://uptownherndon.com/uploads/files/zixixuposobomokejakor.pdfIn PDF document text
- https://supermagnum-bg.com/userfiles/file/fumobefetukomore.pdfIn PDF document text
- https://rzfmuhasebe.com/userfiles/file/mixixilubivizixulal.pdfIn PDF document text
- http://impactpluslearning.com/ckfinder/userfiles/files/72926158748.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_off0000dd21.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD21	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000f533.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF533	17776 bytes
SHA-256: `b262bb51f6db7772ab31e555a8b3ee9bdfede537b1968024bbe333ebeddc1f46`
`font_02_sfnt_off000122a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122A5	10544 bytes
SHA-256: `1c5edd670c8723c8727901a64454aff8538ecb3a5972f8aa9d42073285a1184f`

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