PDF malware analysis — malicious · cba3029a9ab94d1c

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 17:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 21cd91ef9adbc0c602a7d39dea8a43a0 SHA-1: 4e14e1b9e8568e1027281927f72d1bada59a9164 SHA-256: cba3029a9ab94d1cc7ae649a698dc71dc3fb9d4cba79714bb7abff7e5fdc04a8

146 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and the presence of external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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://trans-serwis.com/userfiles/file/fuzezuxewalekuv.pdf In PDF document text
- https://angkalaris.com/contents/files/kazowi.pdfIn PDF document text
- https://biographiewerkstatt-singer.de/userfiles/file/najef.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2c428c365---65937224124.pdfIn PDF document text
- http://delannahotel.com/user_img/file/44935037103.pdfIn PDF document text
- https://empresa-venta.hr/files/12592189678.pdfIn PDF document text
- http://tryinvest.eu/userfiles/files/2608071185.pdfIn PDF document text
- http://cocoon-source-harmonie.fr/public/file/47278882673.pdfIn PDF document text
- http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/89659325630.pdfIn PDF document text
- https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/muliwetifefubu.pdfIn PDF document text
- http://fzcce.com/aimgs/uload/files/58613710807.pdfIn PDF document text
- https://rakowka.pl/userfiles/file/55778337908.pdfIn PDF document text
- https://zniczekowalczyk.com/user_images/file/fevurositebobokojigo.pdfIn PDF document text
- https://zemtechnika.lt/public/site/0files/94213879625.pdfIn PDF document text
- http://dokturmice.com/ckfinder/userfiles/files/zalazedefefukakegip.pdfIn PDF document text
- http://allier-genealogie.org/File:/tuludumefusemazurixob.pdfIn PDF document text
- http://vimar.ua/userfiles/files/mugusavibope.pdfIn PDF document text
- http://mbjarrahi.com/UploadedFiles/New/file/jugikanuxad.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351305cc7c7---kuvekumivagunavotigaz.pdfIn PDF document text
- http://vibrator4you.cz/UserFiles/File/sivanuxuzibolizezob.pdfIn PDF document text
- http://theorientgarden.iorderfoods.com/uploads/files/tijezaluzufijulopodet.pdfIn PDF document text
- https://lemarko.com/userfiles/file/44986658836.pdfIn PDF document text
- https://akemi.ro/hirek/file/mokujekonipoz.pdfIn PDF document text
- http://psychologkmalinowska.pl/ckfinder/userfiles/files/53280596017.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=can+i+see+my+wifi+password+on+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_off0000ceea.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEEA	10748 bytes
SHA-256: `b35d9cd490a2536d7ed3c895a89bbade6aa0f927a1a2d29edb04ac02a9091aae`
`font_01_sfnt_off0000e7af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7AF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0000ffc1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFC1	17840 bytes
SHA-256: `585eef794d0484054ac381bed53d9cf40bbcff3709f02c4e84d507c446259e09`

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