PDF malware analysis — malicious · c84e1f7beb3d2b01

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 05:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 052ae174163e355cfc4c20bee1bf3381 SHA-1: 252eb45cc6d38bb5bb237d829dc589fbe90ba4c2 SHA-256: c84e1f7beb3d2b017eb0790d659b3d65c5360f4321dd33e7a8380af97e9ffc46

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, with one notable example being http://didaconcept.com/admin/fckeditor/file/bejukazomazuvawol.pdf. The presence of embedded URLs and the 'SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://didaconcept.com/admin/fckeditor/file/bejukazomazuvawol.pdf In PDF document text
- https://hotel-la-licorne.fr/userfiles/file/romifetalum.pdfIn PDF document text
- https://barcelona-health.com/files/galeria/files/76858078867.pdfIn PDF document text
- http://pioneerbuzz.net/userimages/99940896857.pdfIn PDF document text
- https://zmiz.hr/userfiles/file/gudilej.pdfIn PDF document text
- https://tavio.ru/files/file/buwat.pdfIn PDF document text
- https://ausztriasi.spawellness.hu/upload/hirlevel/files/ravis.pdfIn PDF document text
- http://mamnonkitty.com/webroot/img/posts/files/boxafexapo.pdfIn PDF document text
- http://kiiga.ru/userfiles/file/nofoma.pdfIn PDF document text
- http://lumieye.com/userData/ebizro_board/file/10093318467.pdfIn PDF document text
- https://granitabrasive.com/editor_up/tiwerozoxot.pdfIn PDF document text
- http://tourhong.com/FileData/ckfinder/files/20210905_F2F723F92B8AFA90.pdfIn PDF document text
- http://chenruichem.com/upload/files/fosokerivowovorumo.pdfIn PDF document text
- http://35ju.21tg.cn/uploadfile/ckeditor/files/79884232749.pdfIn PDF document text
- https://tutorbolivia.com/userfiles/file/24660565897.pdfIn PDF document text
- http://baihsad.com/userfiles/files/20210905_055418.pdfIn PDF document text
- https://pre-www.bridge-college.com/uploaded/ckeditor/files/dokozozejedodilimov.pdfIn PDF document text
- http://abcbyspu.net/ckfinder/images_store/files/25711855863.pdfIn PDF document text
- http://intertexmedical.com/userfiles/files/purelibukiviwunef.pdfIn PDF document text
- http://club-integra.ru/userfiles/file/30073190914.pdfIn PDF document text
- http://arucax.am/user_images/file/bexigoworitago.pdfIn PDF document text
- http://kayapaliinsaat.net/file/86032213666.pdfIn PDF document text
- http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/c631c1887db4d094026dd7b1fa80b679/53502722070.pdfIn PDF document text
- http://angelofthewinds.org/ckfinder/userfiles/files/robilafalopuxaxubaso.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=best+cctv+camera+app+for+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_off0000cc91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC91	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e4a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4A8	10852 bytes
SHA-256: `f2cea36a19188999ec34b76cb40bbe196b3ffa6381e35559aaffe20e8ecffe94`
`font_02_sfnt_off0000fdc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDC0	17344 bytes
SHA-256: `fcaca227ab5556b70ee4ad5a0a093e2fa58109fa5395b2c1e83a1ccca883abea`

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