PDF malware analysis — malicious · d3cc40f3eb19fdc5

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 08:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 6c22d31e306e45f22cba81190d28df2f SHA-1: 2265ed2431d64da46a1868cc6f65496e0571f6ad SHA-256: d3cc40f3eb19fdc53245f8a559dc0c0c5211a407615e6c9a9a2debcbce165e41

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://nhanloc.net/userfiles/file/63470614573.pdf In PDF document text
- http://ks4073.com/file_media/file_image/file/5579458248.pdfIn PDF document text
- http://kimwendelldesign.com/ckfinder/userfiles/files/jexasubabalajenekejal.pdfIn PDF document text
- https://vleek.com/uploads/files/senesolaz.pdfIn PDF document text
- https://corpus.bg/files/fck/file/44010800513.pdfIn PDF document text
- http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16136859496034---95582584580.pdfIn PDF document text
- http://aven.su/userfiles/file/zuxejezuzinajakarawilekup.pdfIn PDF document text
- https://aczv.fr/userfiles/file/3045568490.pdfIn PDF document text
- http://makesomenoise.hu/upload/file/74504731082.pdfIn PDF document text
- http://garagehayashi.com/js/upload/files/95030572660.pdfIn PDF document text
- https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316a1c96455---dokagu.pdfIn PDF document text
- http://mrybalko.ru/files/nidirugutadirum.pdfIn PDF document text
- https://cosplay-expo.it/ckfinder/userfiles/files/liremuxuwun.pdfIn PDF document text
- http://tw-sincere.com/upfiles/editor/files/nemodobagoziwepa.pdfIn PDF document text
- http://utcsp2.rustyramone.com/uploads/files/rotopo.pdfIn PDF document text
- http://mrybalko.ru/files/litovavawowedevaxu.pdfIn PDF document text
- http://kraemer-duennebacke.de/files/file/13786974094.pdfIn PDF document text
- https://concertwristband.com/resimler/files/loxorekezoxeguvagiti.pdfIn PDF document text
- https://psychotherapie-coeppicus.ch/userfiles/files/88312139656.pdfIn PDF document text
- http://sntaviator.ru/ckfinder/userfiles/files/pevewabebaferafojunuxexu.pdfIn PDF document text
- https://svetplus.com/userfiles/files/pevoxujofuweribefunopex.pdfIn PDF document text
- http://recko.ru/ckfinder/userfiles/files/futavisufisexalibit.pdfIn PDF document text
- http://inbjnews.com/data/cheditor/0603/files/57610307202.pdfIn PDF document text
- http://badgerhillfarm.uk/bexipegisabujoxuru.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ipad+pro+launcher+apkPDF 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_off0000d941.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD941	10396 bytes
SHA-256: `7a8af4a0538b2fb9b66dcf335eb5d762f3ee2a9bbb7e971dec5fe1c09b462a1f`
`font_01_sfnt_off0000f09e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF09E	18152 bytes
SHA-256: `b8eb2cf1d1de3157de3adefc58edbd867aeca801a3a58fb549841686a61c15bf`
`font_02_sfnt_off00011f4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F4D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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