PDF malware analysis — malicious · aa3edb4baad4736a

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 12:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 5b940aee3e402d1b7e3f2031245071a5 SHA-1: 0a6c63cfd9b9c4f1e1b157a5b06fadc3d7f10147 SHA-256: aa3edb4baad4736af501797d397d5429ae8f1d6b6ab59c4099c723bd041f3a74

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to lead the user to external, potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 5

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.
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://chcial.ru/uplcv?utm_term=how+to+look+up+wifi+password+on+phone PDF link annotation
- http://elskup.pl/images/assets/file/zudosebarerimanogik.pdfIn PDF document text
- http://www.advokat.com/app/webroot/img/fck/file/nedofaxosigobuvofipuzu.pdfIn PDF document text
- https://steklo-shik.ru/userfiles/file/35672192576.pdfIn PDF document text
- http://propertiesforrent.com/userfiles/file///lusewufajixibilopisixox.pdfIn PDF document text
- https://cardion.dk/gfx/fckimages/file/visowolijepa.pdfIn PDF document text
- http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/90527985575.pdfIn PDF document text
- http://ultraljud.nu/bild/files/63274217839.pdfIn PDF document text
- https://noelex22.org/userfiles/file/rilezomimugilanapuguduzer.pdfIn PDF document text
- https://menlopark.com/wysiwygfiles/file/muxiloxuxusidijog.pdfIn PDF document text
- http://sutinlawkrabi.com/ckfinder/userfiles/files/63584346683.pdfIn PDF document text
- http://wadirumshootingstars.com/userfiles/file///54150183880.pdfIn PDF document text
- http://www.poliklinika-hb.cz/userfiles/file/92312769173.pdfIn PDF document text
- http://ekonopuntos.com/campannas/file/tunejuxagefekizon.pdfIn PDF document text
- https://at1apigroup3.com/contents/files/mitavovepeluwapek.pdfIn PDF document text
- http://voszveszprem.hu/_user/file/2343395258.pdfIn PDF document text
- https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/98767417074.pdfIn PDF document text
- https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137d96dbf240---43500110784.pdfIn PDF document text
- http://mesterteto.hu/userfiles/file/46314447694.pdfIn PDF document text
- http://ylpqzl.com/ckfinder/userfiles/files/77330725199.pdfIn PDF document text
- https://hygradeinsulators.com/images/uploads/file/57074064897.pdfIn PDF document text
- http://spadhotel.com/basefile/spadhotelcom/files/61641823764.pdfIn PDF document text
- http://rld-carbon.com/file/vebagavovulidefon.pdfIn PDF document text
- http://tmtechvn.com/webroot/img/files/lezemuzupo.pdfIn PDF document text
- http://babijie.com/upload_fck/file/2021-9-9/20210909055556625052.pdfIn PDF document text
- https://akvanova.ru/sites/default/files/79124079296.pdfIn PDF document text
- http://cuatro-pr.org/sites/default/files/file/dapokogixulu.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_off0000e6c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6C5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000fed7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFED7	18020 bytes
SHA-256: `0180011bc8812ca90e79a9d3120d9bf30852a6b8df0601b850d4805739ac57e7`
`font_02_sfnt_off00012dff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DFF	10864 bytes
SHA-256: `396a62be20c4904b976bbccc732dd88653f9c47929e94c1dc11f92fc3f8c0b00`

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