PDF malware analysis — malicious · bc9e15b1df59a0d2

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 06:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 2bbec1dad5bff576099def4db0a2a1f0 SHA-1: c7e1af48b40756e428290532ce5d629e5a50981a SHA-256: bc9e15b1df59a0d27fb86b99a2c3a8049b97ac2819630b67a9c5f3c34df3826c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many pointing to PDF files hosted on potentially disposable domains, suggests a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm designed to obscure the true destination.

Machine Learning

Nyx PDF Classifier malicious score 0.9968

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 http://tehla.eu/userfiles/file/13194297192.pdf In PDF document text
- https://mtestbd.com/assets/uploads/files/69687594056.pdfIn PDF document text
- http://evolution-dev.com/file_media/file_image/file/punotetadobumalonufebivi.pdfIn PDF document text
- https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0043099099eb98b38c68e3242e43c716/97700904422.pdfIn PDF document text
- https://villatoscana-pi.it/userfiles/file/rovarusa.pdfIn PDF document text
- http://mimarkamilozkartal.com/userfiles/files/41277336759.pdfIn PDF document text
- http://quesnelbusinessnetwork.ca/userfiles/file/74439231580.pdfIn PDF document text
- http://bsl-trans.ru/admin/ckfinder/userfiles/files/dakaludumibegaf.pdfIn PDF document text
- http://patrickstaxi.fr/userfiles/file/52088205728.pdfIn PDF document text
- https://petrovsky14.ru/docs/files/kuvex.pdfIn PDF document text
- http://himalayakebab.com/shipinc/userfiles/files/66410323469.pdfIn PDF document text
- http://tabletopad.com/images/file/jorukidiguwuwegug.pdfIn PDF document text
- http://ranjoysarkar.in/FCKeditor/file/30013077672.pdfIn PDF document text
- http://zvaracskaskola.eu/editor_uploads/system/files/29360155253.pdfIn PDF document text
- https://panelshock.com/userfiles/file/7897919992.pdfIn PDF document text
- http://savitaco.com/uploads/images/files/nadutawerimenusir.pdfIn PDF document text
- https://vinadesigndanang.vn/uploads/image/files/59737101418.pdfIn PDF document text
- http://daisin1977.com/js/upload/files/kadewugebexo.pdfIn PDF document text
- http://workontext.ru/media/file/31227793295.pdfIn PDF document text
- https://aptitudeclass.com/ckfinder/userfiles/files/12789192031.pdfIn PDF document text
- http://mhzsolutionz.com/userfiles/file/nisuxuzi.pdfIn PDF document text
- http://sipsak.nl/userfiles/file/6691557792.pdfIn PDF document text
- https://maisonfamillesrimouski.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/71769462428.pdfIn PDF document text
- https://unitytradecapital.com/ckfinder/userfiles/files/62506990200.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+com+file+transfer+windows+7PDF 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_off0000af6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAF6B	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000c782.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC782	10756 bytes
SHA-256: `85c6bea4580d1ee59fcb80c43bdf8f1a9073ec4981beb1683afc345d67e5bfc3`
`font_02_sfnt_off0000e05a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE05A	16596 bytes
SHA-256: `5bcf821a63b9ce634315a29620992ec5bb5c91ece704eb20abbe76d5f83c3593`

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